Sohrab Mirassi - Academia.edu (original) (raw)

Papers by Sohrab Mirassi

Geotechnical Geology, Jun 1, 2018

Applied Soft Computing, 2008

Conventionally, the multiple linear regression procedure has been known as the most popular model... more Conventionally, the multiple linear regression procedure has been known as the most popular models in simulating hydrological time series. However, when the nonlinear phenomenon is significant, the multiple linear will fail to develop an appropriate predictive model. Recently, intelligence system approaches such as artificial neural network (ANN) and neuro-fuzzy methods have been used successfully for time series modelling. In most instances for neural networks, multi layer perceptrons (MLPs) that are trained with the back-propagation algorithm have been used. The major shortcoming of this approach is that the knowledge contained in the trained networks is difficult to interpret. Using neuro-fuzzy approaches, which enable the information that is stored in trained networks to be expressed in the form of a fuzzy rule base, would help to overcome this issue. In the present study, a time series neuro-fuzzy model is proposed that is capable of exploiting the strengths of traditional time series approaches. The aim of this article is to investigate the potential of a neuro-fuzzy system with a Sugeno inference engine, considering different numbers of membership functions. Three rivers have been selected and daily prediction for them was applied. For better judgment, outcomes of the network have been compared to an autoregressive model.

Scientific Quarterly Journal of Iranian Association of Engineering Geology, Aug 22, 2020

Earthquake Engineering and Engineering Vibration, 2021

Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, c... more Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, cause roadbed subsidence, and so on. It is therefore essential to evaluate various sinkholes in different depths and sizes to assess the risk of collapse. This paper evaluates the effect of different cavities on Rayleigh-wave propagation and body (P) wave refraction. Rayleigh (R) wave propagation is analyzed according to the classical multi-channel analysis of surface waves (MASW) method also considering the R-wave backscattering. Synthetic seismic traces are computed by means of finite element modeling (FEM) for cavity and intrusion at different depths and sizes. Furthermore, field acquisition data is used to verify the detection effect of a cavity on R- and P-waves. The results show that the presence of backscattered R-waves and the changes in the R-wave velocity spectrum can help in cavity identification. Additional possible evidence is represented by significant changes in the refraction travel times over the cavity location. It can be concluded that the field data are in good agreement with the synthetic, and it could be effective to consider the results of both R- and P-wave analysis in order to efficiently identify the cavities.

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of ground-water level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of cre-ated cracks and fissures with dire...

International Journal of Sciences: Basic and Applied Research (IJSBAR)

In recent years, land subsidence due to different reason such as excessive withdrawal of groundwa... more In recent years, land subsidence due to different reason such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government and also changed the quality of ground water resources; increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world) and creating fissures and sinkholes. However, some of the buildings in rural areas have lost utilization capability and their Habitation in Fars Province due to neglect of this phenomenon and propagation of cracks and gaps in the roof, Floors and walls. In this paper field observation was conducted and identified damaged villages in Marvdasht plain to investigate effects of faults and earthquakes on land subsidence and available gaps. And ...

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of groundwater level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of created cracks and fissures with direction of available faults in the studied area have been investigated as the main factors affecting the soil settlement. At the end of the research, appropriate solutions for the land subsidence prevention and consequently the reduction of the related damages are presented.

Asian Journal of Civil Engineering

Earthquake Engineering and Engineering Vibration, 2021

Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, c... more Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, cause roadbed subsidence, and so on. It is therefore essential to evaluate various sinkholes in different depths and sizes to assess the risk of collapse. This paper evaluates the effect of different cavities on Rayleigh-wave propagation and body (P) wave refraction. Rayleigh (R) wave propagation is analyzed according to the classical multi-channel analysis of surface waves (MASW) method also considering the R-wave backscattering. Synthetic seismic traces are computed by means of finite element modeling (FEM) for cavity and intrusion at different depths and sizes. Furthermore, field acquisition data is used to verify the detection effect of a cavity on R-and P-waves. The results show that the presence of backscattered R-waves and the changes in the R-wave velocity spectrum can help in cavity identification. Additional possible evidence is represented by significant changes in the refraction travel times over the cavity location. It can be concluded that the field data are in good agreement with the synthetic, and it could be effective to consider the results of both R-and P-wave analysis in order to efficiently identify the cavities.

Advances in Environmental Biology

Drought and excessive dropping in ground water levels are the main disaster and principal problem... more Drought and excessive dropping in ground water levels are the main disaster and principal problems in past few years in Iran. Moreover, being different from other natural disasters such as flood, earthquake is caused an excessive damage to human life and natural ecosystems. Mainly of These differences are due to gradually effect of during relatively long period of drought, impossibility to determine the exact start and end time and geographical extent of its effect. However by increasing population, irregular harvesting of underground water supplies and lack of appropriate management, we saw plenty of damages nowadays. One of these damages, is land subsidence phenomenon that caused by drought and decline in groundwater levels which has appeared in most plains of Iran. In this paper by using comprehensive review on Iran country has been conducted a widespread studies and research about status of groundwater level decline and land subsidence phenomenon with considering fundamental aff...

خشكسالي و افت بی‌رویه سطح آب‌های زیرزمینی يكي از بلايا و معضلات مهم کشور ایران در چند سال گذشته م... more خشكسالي و افت بی‌رویه سطح آب‌های زیرزمینی يكي از بلايا و معضلات مهم کشور ایران در چند سال گذشته می‌باشد و ضمن متفاوت بودن با ديگر حوادث طبيعي از قبيل سيل، طوفان و زلزله، خسارات زيادي به زندگي انسان و اکوسیستم‌های طبيعي وارد ‌آورده است. عمده اين تفاوت‌ها ناشی از تأثیر تدريجي خشكسالي طي يک دوره نسبتاً طولاني، عدم امكان تعيين دقيق زمان شروع و خاتمه و وسعت جغرافيايي تأثیر آن می‌باشد. حال آنکه با افزایش جمعیت، برداشت بی رویه از منابع آب‌های زیرزمینی و عدم مدیریت مناسب، امروزه شاهد آسیب‌های فراوان ناشی از آن می‌باشیم. یکی از این آسیب‌ها، پدیده فرونشست زمین می‌باشد که ناشی از خشکسالی و افت سطح آب زیرزمینی در اغلب دشت‌های ایران پدیدار شده است. در این مقاله با انجام مطالعات و تحقیقات گسترده در سطح کشور به بررسی جامع وضعیت افت سطح آب‌های زیرزمینی و مخاطره فرونشست سطح زمین با در نظر گرفتن عوامل اساسی اثرگذار و آسیب¬های ناشی از آن پرداخته شده است. همچنین سعی شده برای درک و تفهیم بهتر موضوع، چند نمونه از مطالعات موردی انجام شده توسط نویسندگان، ارایه و مورد تحلیل و ارزیابی قرار گیرد؛ و در نهایت ب...

فرونشست سطح زمين حاصل از نيروي قابل توجهي است كه به ساختگاه به صورت همه جانبه اعمال می‌شود و در ص... more فرونشست سطح زمين حاصل از نيروي قابل توجهي است كه به ساختگاه به صورت همه جانبه اعمال می‌شود و در صورت گسترش آن، به ساختارهاي زيربنايي موجود، خسارت وارد می‌کند و در برخی موارد زندگي بشر را به مخاطره می‌اندازد. فرونشست می‌تواند آسيب جدي به واحدهای صنعتي و منازل مسکوني وارد كند. به صورت کلی در بیش از نیمی از استانهای کشور به دلایل مختلف رخداد پدیده فرونشست گزارش کردیده است که معضلات و مشکلات فراوانی را ایجاد نموده است. در این مقاله به بررسی و تحلیل عمده فرونشست های اتفاق افتاده در سطح جهان به خصوص در مناطق و دشت ها کشور ایران پرداخته شده است و در ادامه نتایج بدست آمده از پژوهش های موردی انجام گرفته در دشتهای استان فارس و استان چهارمحال و بختیاری مورد ارزیابی قرار گرفته است. سپس در جهت شناسایی، کنترل و جلوگیری از آسیب های ناشی از این پدیده به بیان و تشریح عوامل اصلی و چگونگی رخداد آن پرداخته شده است. همچنین سعی گردیده است که علاوه بر انجام مطالعات موردی در استان فارس، با بهره گیری از تجربیات بدست آمده در پژوهشهای مشابه در سایر مناطق کشور، راهکارهای مناسب جهت جلوگیری از این پدیده ارائه گردد.

Water consumption rate in the plains of Iran is very alarming. In most provinces, during the past... more Water consumption rate in the plains of Iran is very alarming. In most provinces, during the past few years, low rainfall, lack of appropriate nutrition for aquifers and continuous pumping are the causes of a significant decrease in groundwater level of the plain. Among the most important and manifest consequences of groundwater level dropping are land subsidence, increase of the cost of drilling deeper wells and water pumping, decrease of the level of water of wells and their quality, and drying of springs. In this research, the areas that suffered the most damage due to water crisis in terms of the indiscriminate withdrawal and excessive drop over the past few years are specified and evaluated through accurate field observations. The obtained results from the investigation of indiscriminate withdrawal of the wells, rainfall decrease and sharp fall in ground water level, especially in the past few years are indicative of a 6-year drought period in Fars province and a 4-year one in ...

In recent year, population growth and increasing the groundwater withdrawal is caused water level... more In recent year, population growth and increasing the groundwater withdrawal is caused water level falling. these excessive withdrawal of groundwater resources is created subsidence phenomenon in Fars province especially in Marvdasht plain that has led to significant damages to farmlands, residential buildings, roads, transmission lines, Monuments and also changed the quality of ground water resources, increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world), creating fissures and sinkholes. In this paper, at the first, the areas that suffered the most damage in the last few years have been identified and evaluated by field observation. Then the drought period and the annual drop rates in water level are determined by using the data of changes status in rainfall and underground water level. Following, geological maps and data of drilling logs in Marvdasht plain have been studied in order to determine the soil layering and ...

International Journal of Geosciences, 2012

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of groundwater level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of created cracks and fissures with direction of available faults in the studied area have been investigated as the main factors affecting the soil settlement. At the end of the research, appropriate solutions for the land subsidence prevention and consequently the reduction of the related damages are presented.

International Journal of Sciences Basic and Applied Research, Apr 13, 2013

In recent years, land subsidence due to different reason such as excessive withdrawal of groundwa... more In recent years, land subsidence due to different reason such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government and also changed the quality of ground water resources; increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world) and creating fissures and sinkholes. However, some of the buildings in rural areas have lost utilization capability and their Habitation in Fars Province due to neglect of this phenomenon and propagation of cracks and gaps in the roof, Floors and walls. In this paper field observation was conducted and identified damaged villages in Marvdasht plain to investigate effects of faults and earthquakes on land subsidence and available gaps. And vulnerability index of these areas (vulnerability index of structures) was identified by using seismic method in the range of Shul village. And also soil status was determined by using Geoelectric method. Then, vulnerability status of damaged buildings was presented into future earthquakes and at the end of the research, suitable solutions were offered to prevent this phenomenon and its damages.

Geotechnical Geology, Jun 1, 2018

Applied Soft Computing, 2008

Conventionally, the multiple linear regression procedure has been known as the most popular model... more Conventionally, the multiple linear regression procedure has been known as the most popular models in simulating hydrological time series. However, when the nonlinear phenomenon is significant, the multiple linear will fail to develop an appropriate predictive model. Recently, intelligence system approaches such as artificial neural network (ANN) and neuro-fuzzy methods have been used successfully for time series modelling. In most instances for neural networks, multi layer perceptrons (MLPs) that are trained with the back-propagation algorithm have been used. The major shortcoming of this approach is that the knowledge contained in the trained networks is difficult to interpret. Using neuro-fuzzy approaches, which enable the information that is stored in trained networks to be expressed in the form of a fuzzy rule base, would help to overcome this issue. In the present study, a time series neuro-fuzzy model is proposed that is capable of exploiting the strengths of traditional time series approaches. The aim of this article is to investigate the potential of a neuro-fuzzy system with a Sugeno inference engine, considering different numbers of membership functions. Three rivers have been selected and daily prediction for them was applied. For better judgment, outcomes of the network have been compared to an autoregressive model.

Scientific Quarterly Journal of Iranian Association of Engineering Geology, Aug 22, 2020

Earthquake Engineering and Engineering Vibration, 2021

Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, c... more Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, cause roadbed subsidence, and so on. It is therefore essential to evaluate various sinkholes in different depths and sizes to assess the risk of collapse. This paper evaluates the effect of different cavities on Rayleigh-wave propagation and body (P) wave refraction. Rayleigh (R) wave propagation is analyzed according to the classical multi-channel analysis of surface waves (MASW) method also considering the R-wave backscattering. Synthetic seismic traces are computed by means of finite element modeling (FEM) for cavity and intrusion at different depths and sizes. Furthermore, field acquisition data is used to verify the detection effect of a cavity on R- and P-waves. The results show that the presence of backscattered R-waves and the changes in the R-wave velocity spectrum can help in cavity identification. Additional possible evidence is represented by significant changes in the refraction travel times over the cavity location. It can be concluded that the field data are in good agreement with the synthetic, and it could be effective to consider the results of both R- and P-wave analysis in order to efficiently identify the cavities.

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of ground-water level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of cre-ated cracks and fissures with dire...

International Journal of Sciences: Basic and Applied Research (IJSBAR)

In recent years, land subsidence due to different reason such as excessive withdrawal of groundwa... more In recent years, land subsidence due to different reason such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government and also changed the quality of ground water resources; increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world) and creating fissures and sinkholes. However, some of the buildings in rural areas have lost utilization capability and their Habitation in Fars Province due to neglect of this phenomenon and propagation of cracks and gaps in the roof, Floors and walls. In this paper field observation was conducted and identified damaged villages in Marvdasht plain to investigate effects of faults and earthquakes on land subsidence and available gaps. And ...

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of groundwater level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of created cracks and fissures with direction of available faults in the studied area have been investigated as the main factors affecting the soil settlement. At the end of the research, appropriate solutions for the land subsidence prevention and consequently the reduction of the related damages are presented.

Asian Journal of Civil Engineering

Earthquake Engineering and Engineering Vibration, 2021

Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, c... more Sinkholes and cavities can represent serious hazards to human safety and urban infrastructures, cause roadbed subsidence, and so on. It is therefore essential to evaluate various sinkholes in different depths and sizes to assess the risk of collapse. This paper evaluates the effect of different cavities on Rayleigh-wave propagation and body (P) wave refraction. Rayleigh (R) wave propagation is analyzed according to the classical multi-channel analysis of surface waves (MASW) method also considering the R-wave backscattering. Synthetic seismic traces are computed by means of finite element modeling (FEM) for cavity and intrusion at different depths and sizes. Furthermore, field acquisition data is used to verify the detection effect of a cavity on R-and P-waves. The results show that the presence of backscattered R-waves and the changes in the R-wave velocity spectrum can help in cavity identification. Additional possible evidence is represented by significant changes in the refraction travel times over the cavity location. It can be concluded that the field data are in good agreement with the synthetic, and it could be effective to consider the results of both R-and P-wave analysis in order to efficiently identify the cavities.

Advances in Environmental Biology

Drought and excessive dropping in ground water levels are the main disaster and principal problem... more Drought and excessive dropping in ground water levels are the main disaster and principal problems in past few years in Iran. Moreover, being different from other natural disasters such as flood, earthquake is caused an excessive damage to human life and natural ecosystems. Mainly of These differences are due to gradually effect of during relatively long period of drought, impossibility to determine the exact start and end time and geographical extent of its effect. However by increasing population, irregular harvesting of underground water supplies and lack of appropriate management, we saw plenty of damages nowadays. One of these damages, is land subsidence phenomenon that caused by drought and decline in groundwater levels which has appeared in most plains of Iran. In this paper by using comprehensive review on Iran country has been conducted a widespread studies and research about status of groundwater level decline and land subsidence phenomenon with considering fundamental aff...

خشكسالي و افت بی‌رویه سطح آب‌های زیرزمینی يكي از بلايا و معضلات مهم کشور ایران در چند سال گذشته م... more خشكسالي و افت بی‌رویه سطح آب‌های زیرزمینی يكي از بلايا و معضلات مهم کشور ایران در چند سال گذشته می‌باشد و ضمن متفاوت بودن با ديگر حوادث طبيعي از قبيل سيل، طوفان و زلزله، خسارات زيادي به زندگي انسان و اکوسیستم‌های طبيعي وارد ‌آورده است. عمده اين تفاوت‌ها ناشی از تأثیر تدريجي خشكسالي طي يک دوره نسبتاً طولاني، عدم امكان تعيين دقيق زمان شروع و خاتمه و وسعت جغرافيايي تأثیر آن می‌باشد. حال آنکه با افزایش جمعیت، برداشت بی رویه از منابع آب‌های زیرزمینی و عدم مدیریت مناسب، امروزه شاهد آسیب‌های فراوان ناشی از آن می‌باشیم. یکی از این آسیب‌ها، پدیده فرونشست زمین می‌باشد که ناشی از خشکسالی و افت سطح آب زیرزمینی در اغلب دشت‌های ایران پدیدار شده است. در این مقاله با انجام مطالعات و تحقیقات گسترده در سطح کشور به بررسی جامع وضعیت افت سطح آب‌های زیرزمینی و مخاطره فرونشست سطح زمین با در نظر گرفتن عوامل اساسی اثرگذار و آسیب¬های ناشی از آن پرداخته شده است. همچنین سعی شده برای درک و تفهیم بهتر موضوع، چند نمونه از مطالعات موردی انجام شده توسط نویسندگان، ارایه و مورد تحلیل و ارزیابی قرار گیرد؛ و در نهایت ب...

فرونشست سطح زمين حاصل از نيروي قابل توجهي است كه به ساختگاه به صورت همه جانبه اعمال می‌شود و در ص... more فرونشست سطح زمين حاصل از نيروي قابل توجهي است كه به ساختگاه به صورت همه جانبه اعمال می‌شود و در صورت گسترش آن، به ساختارهاي زيربنايي موجود، خسارت وارد می‌کند و در برخی موارد زندگي بشر را به مخاطره می‌اندازد. فرونشست می‌تواند آسيب جدي به واحدهای صنعتي و منازل مسکوني وارد كند. به صورت کلی در بیش از نیمی از استانهای کشور به دلایل مختلف رخداد پدیده فرونشست گزارش کردیده است که معضلات و مشکلات فراوانی را ایجاد نموده است. در این مقاله به بررسی و تحلیل عمده فرونشست های اتفاق افتاده در سطح جهان به خصوص در مناطق و دشت ها کشور ایران پرداخته شده است و در ادامه نتایج بدست آمده از پژوهش های موردی انجام گرفته در دشتهای استان فارس و استان چهارمحال و بختیاری مورد ارزیابی قرار گرفته است. سپس در جهت شناسایی، کنترل و جلوگیری از آسیب های ناشی از این پدیده به بیان و تشریح عوامل اصلی و چگونگی رخداد آن پرداخته شده است. همچنین سعی گردیده است که علاوه بر انجام مطالعات موردی در استان فارس، با بهره گیری از تجربیات بدست آمده در پژوهشهای مشابه در سایر مناطق کشور، راهکارهای مناسب جهت جلوگیری از این پدیده ارائه گردد.

Water consumption rate in the plains of Iran is very alarming. In most provinces, during the past... more Water consumption rate in the plains of Iran is very alarming. In most provinces, during the past few years, low rainfall, lack of appropriate nutrition for aquifers and continuous pumping are the causes of a significant decrease in groundwater level of the plain. Among the most important and manifest consequences of groundwater level dropping are land subsidence, increase of the cost of drilling deeper wells and water pumping, decrease of the level of water of wells and their quality, and drying of springs. In this research, the areas that suffered the most damage due to water crisis in terms of the indiscriminate withdrawal and excessive drop over the past few years are specified and evaluated through accurate field observations. The obtained results from the investigation of indiscriminate withdrawal of the wells, rainfall decrease and sharp fall in ground water level, especially in the past few years are indicative of a 6-year drought period in Fars province and a 4-year one in ...

In recent year, population growth and increasing the groundwater withdrawal is caused water level... more In recent year, population growth and increasing the groundwater withdrawal is caused water level falling. these excessive withdrawal of groundwater resources is created subsidence phenomenon in Fars province especially in Marvdasht plain that has led to significant damages to farmlands, residential buildings, roads, transmission lines, Monuments and also changed the quality of ground water resources, increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world), creating fissures and sinkholes. In this paper, at the first, the areas that suffered the most damage in the last few years have been identified and evaluated by field observation. Then the drought period and the annual drop rates in water level are determined by using the data of changes status in rainfall and underground water level. Following, geological maps and data of drilling logs in Marvdasht plain have been studied in order to determine the soil layering and ...

International Journal of Geosciences, 2012

In recent years, the land subsidence due to different phenomena such as excessive withdrawal of g... more In recent years, the land subsidence due to different phenomena such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to the land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government. In this paper a case study is performed for Marvdasht plain and rural regions of Fars province, Iran. All affecting parameters and their related damages are considered in the study. The variation of groundwater level and the conditions of rainfall and drought processes in recent years are investigated. The effects of faults and the seismic vulnerability of the regions are also studied by seismic methods. Such factor as groundwater level drop, thickness of clay layers, variation in the thickness of layers at the hillsides and the coincidence of the direction of created cracks and fissures with direction of available faults in the studied area have been investigated as the main factors affecting the soil settlement. At the end of the research, appropriate solutions for the land subsidence prevention and consequently the reduction of the related damages are presented.

International Journal of Sciences Basic and Applied Research, Apr 13, 2013

In recent years, land subsidence due to different reason such as excessive withdrawal of groundwa... more In recent years, land subsidence due to different reason such as excessive withdrawal of groundwater resources has lead to significant damages to farmlands, residential buildings, roads and transmission lines. Inattention to land subsidence results in the ruining of buildings which in turn causes the migration of people and imposes financial and social costs on the government and also changed the quality of ground water resources; increase Salinization of water, depletion of underground aquifers (the second largest fresh water source in the world) and creating fissures and sinkholes. However, some of the buildings in rural areas have lost utilization capability and their Habitation in Fars Province due to neglect of this phenomenon and propagation of cracks and gaps in the roof, Floors and walls. In this paper field observation was conducted and identified damaged villages in Marvdasht plain to investigate effects of faults and earthquakes on land subsidence and available gaps. And vulnerability index of these areas (vulnerability index of structures) was identified by using seismic method in the range of Shul village. And also soil status was determined by using Geoelectric method. Then, vulnerability status of damaged buildings was presented into future earthquakes and at the end of the research, suitable solutions were offered to prevent this phenomenon and its damages.