Venturing deep into high right-bank slide of river Ganges near Chandernagore Strand, in Hooghly, India (original) (raw)
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Indonesian Journal of Innovation and Applied Sciences (IJIAS)
India is a country of rivers. Sundarban is the world’s largest deltaic region, which is also part of the Ganga region. Highly populated this region is frequently faced intensive floods. The objective of this paper is to give a notion about the potential embankment zone along the Vidyadhari River. Changes in riverbanks since 1972 have been highlighted through GIS and Remote Sensing Applications. Through this paper, erosional and depositional zones along the Vidyadhari River are also spotted out. The potential embankment zone is measured by the vulnerability analysis based on river bank shifting. The proper embankment technology has also suggested a sustainable embankment along the river Vidyadhari river, which is guided by the Irrigation Department, Government of West Bengal.
River Bank erosion has emerged to be one of the most annoying environmental hazards these days. It is a complex process which incorporates actions of several complex processes and cannot be attributed to any single process. At present, the average quantum of land engulfed by the rivers is about 800 hectares in West Bengal. River Bhagirathi –Hooghly, the most prominent river of the state has resorted to large scale bank slumping and flood in Shantipur, Nadia, the birth place of Vaishnavism. Though there has been immense study on the erosional activity of this river in the state, Shantipur has not got enough importance on this matter. Eminent national and international scholars have detected the causes of such erosional activities to be the typical flow properties of the river, the structural and compositional properties of the bank and climatic characteristics of the concerned area. This paper tries to throw some light upon the factors which have probably acted jointly to produce such large scale wearing away of land in this part of the planet.
Riverbank Erosion and Its Impact: A Study on Ganges River Affected Area
Riverbank erosion is an unpredictable hazard that has severe impacts on the marginal people. This study represents the erosion of the Ganges River on Uzirpur union (the lowest administrative unit of Bangladesh government) of Shibganj upazila under Chapainawabganj district through different years and its impacts on the supplement of basic needs e.g. food supply, dress supply, family shelter, medical treatment etc. of life subsistence. The erosion of the river has been deliberated from LANDSAT Thematic Mapper (TM) satellite images. The composition of eroded area has been calculated applying Geographical Information System (GIS) technique. Total 86 households were selected for questionnaire survey using standard statistical procedures. The displacees who were dislocated due to erosion were selected for this impact study. The economic well-being status of the households was categorized by the definition of World Bank (2004). This study found that a considerable portion of the study area has been eroded over the last few decades and these consequent massive erosions have ruthless impacts on food supply, dress supply, family shelter and medical treatment. In addition to that the relentless impacts on economic status and significant changes on occupation have also been revealed. It also suggests that some important initiatives can be implemented to reduce this erosion and its consequent impacts.
Riverbank erosion is one of the most unpredictable and critical type of disasters that takes tolls less in lives but more in livelihood such as agricultural land and homesteads along with other livelihood options that are evacuated. River Diana, the main right bank tributary of the Jaldhaka, originates in Bhutan and flows south-westward into Jalpaiguri. The present study concentrates on Khairkata Village, a small village on the right bank of Diana where severe problems of bank erosion and spilling exist. Channel migration and severe bank failures have taken place almost every year that threatens the only livelihood option of the population. In addition, severe flooding destroys standing crops and disrupts communication. Because of the dynamic nature of the braided river and the failure of structural measures, the sufferings of the people continue. Long-term policies should be taken to cope up with the bank erosion taking into account the social and institutional adjustment measures. Introduction Stream bank erosion is a natural process that over time has resulted in the formation of the productive flood plains and alluvial terraces common in the middle and lower reaches of many river systems. Events like flooding can trigger dramatic and sudden changes in rivers and streams. However, land use and stream management can also trigger erosion responses. The responses can be complex, often resulting in accelerated rates of erosion and sometimes affecting stability for decades. Over-clearing of catchment and stream bank vegetation, poorly managed sand and gravel extraction, and stream straightening works are examples of management practices which result in accelerated rates of bank erosion. Human activities have altered the natural processes in the present day rivers. The activities in one location (riverbank protection, riverbed excavation) can alter the flow velocity patterns and thereby affect erosion on the opposite bank and the scouring/sedimentation process of the downstream riverbed (Miyazawa, Sunada & Sokhem, 2008).
2017
In the present study, a method for developing a quantitative prediction of river bank erosion is presented. A stream bank erodibility index was assessed to study the stability of the river bank. To assess the stability of the river bank erosion hazard index (BEHI) was estimated in consultation with bank height, bank slope, rooting depth, rooting density, and surface protection. In the upstream of Farraka Barriage between Rajmahal and Farakka, the continuous shifting of the left bank of the river Ganga and associated river bank erosion invited the loss of agricultural land and socioeconomic vulnerability in most of the Mouzas of Manikchak and Kaliachak block of Malda district, West Bengal. In Manikchak block, 13 mouzas are severely affected by river bank erosion. The estimated BEHI of Narayanpur, Manikchak, Gopalpur, and Duarni Tarif are high which indicates the river bank instability. The satellite data of LANDSAT TM 5, LANDSAT MSS 1 and LANDSAT ETM 7 for the year 1973, 1999 and 201...
2014
The creation of regional imbalance, inequalities and differentiation in India, starts with the physiographic element and ends with economic, and socio-cultural parameters of the inhabitants/population. An attempt has been made to analyze and report the river bank erosion due to morphometric changes of the river Ganga,Malda district making thus portion a high risk zone. For that physical process namely river bank erosion may affect the economic and socio-cultural aspects and creates drastic change over the period. Continuous monitoring and maintenance of these flood induced river bank management are necessary for the beneficial result. The distressed people demand a holistic and positive approach to tackle the problem.
IAEME PUBLICATION, 2020
The problem of bank erosion by the river is becoming very serious day by day. The state of Assam in India is such a flood affected region which bears the brunt of bank erosion by the mighty river Brahmaputra and its tributaries in every rainy season. The flood and bank erosion by the river Jia Bharali, a right bank tributary of the Brahmaputra, have been creating havoc in the Panchmile area of Tezpur town for the last few decades. Due to its increasing erosive intensity day by day the Panchmie area is now under severe threat of erosion and the river start to shift towards northwest, if it’s shifting continues then it will be a thinkable matter for the people of Tezpur town in near future. Keeping this in mind, an attempt to study about the bank erosion problem of Panchmile area and its consequent impact in details with the help of geo-spatial tools is made.
WSEAS TRANSACTIONS on FLUID MECHANICS, 2021
River science and engineering has been one of the important study areas for geologists, hydrologists and engineers. The open channel flow and associated hydraulics often initiate several geomechanical hazards including silting and scouring, meandering and migration, floods, etc. Such hazards may lead to disastrous consequences if adequate remedial measures are not undertaken by proper river training works. This paper presents selected case studies in northern and northeastern parts of India where such hazards occurred due to migration of river channel and flooding of adjacent lands. The two study areas have been the Kosi and the Brahmaputra river basins. In the former study area, hazards took place due to eastward migration, whereas in the latter case, significant damages occurred due to scouring and erosion. The descriptions of the hazards occurred, and the mitigation techniques adopted have been briefly summarized in this paper. A critical analysis with prediction techniques for flood occurrence probability and erosion potential has been conducted as well. The relevant conclusions are drawn therefrom.