DEBASRI ROY - Academia.edu (original) (raw)

Papers by DEBASRI ROY

Applied Water Science, 2016

Application of simulation model HEC-5 to analyze the performance of the DVC Reservoir System (a m... more Application of simulation model HEC-5 to analyze the performance of the DVC Reservoir System (a multipurpose system with a network of five reservoirs and one barrage) on the river Damodar in Eastern India in meeting projected future demand as well as controlling flood for synthetically generated future scenario is addressed here with a view to develop an appropriate strategy for its operation. Thomas-Fiering model (based on Markov autoregressive model) has been adopted for generation of synthetic scenario (monthly streamflow series) and subsequently downscaling of modeled monthly streamflow to daily values was carried out. The performance of the system (analysed on seasonal basis) in terms of 'Performance Indices' (viz., both quantity based reliability and time based reliability, mean daily deficit, average failure period, resilience and maximum vulnerability indices) for the projected scenario with enhanced demand turned out to be poor compared to that for historical scenario. However, judicious adoption of resource enhancement (marginal reallocation of reservoir storage capacity) and demand management strategy (curtailment of projected high water requirements and trading off between demands) was found to be a viable option for improvement of the performance of the reservoir system appreciably [improvement being (1-51 %), (2-35 %), (16-96 %), (25-50 %), (8-36 %) and (12-30 %) for the indices viz., quantity based reliability, time based reliability, mean daily deficit, average failure period, resilience and maximum vulnerability, respectively] compared to that with normal storage and projected demand. Again, 100 % reliability for flood control for current as well as future synthetically generated scenarios was noted. The results from the study would assist concerned authority in successful operation of reservoirs in the context of growing demand and dwindling resource.

Journal of Physics D: Applied Physics, 1985

The dielectric constant of mercuric iodide (HgI2) in the form of single crystals has been measure... more The dielectric constant of mercuric iodide (HgI2) in the form of single crystals has been measured both parallel and perpendicular to the c axis. The dependence of the dielectric constant on temperature in the range 300K to 100K has been investigated. This reveals a lowering of dielectric constant with temperature from a value of 10.4 at 300K to 4.0 at 110K. The values of the dielectric constant in both directions are nearly the same, indicating that there is very little anisotropy in HgI2 crystals.

Hydro power is recognized as a renewable source of energy, which is economical, nonpolluting and ... more Hydro power is recognized as a renewable source of energy, which is economical, nonpolluting and environmentally benign. Small and mini hydel projects have the potential to provide energy in remote and hilly areas where extension of grid system is un-economical. In this background, a hydel power project has been proposed to be constructed by Bihar State Hydroelectric Power Corporation Limited, Government of Bihar Enterprise, India on Tiljuga Dhar (a tributary of Kosi River flowing from Nepal) at Nirmali near Hariyahi village of Supaul district in the State of Bihar in India. The basic infrastructural need of this hilly terrain is environment friendly source of power which will accelerate the development of agro-based industries and arrest exodus of people in search of livelihood and would also control insurgency. The present work reports the feasibility analysis of the aforementioned hydel project. It has been found that if a dam, having 41 years of estimated reservoir life period, ...

Hydrology and Earth System Sciences Discussions, 2010

Water is an essential and integral part of livelihood but it is becoming scarce and contaminated ... more Water is an essential and integral part of livelihood but it is becoming scarce and contaminated day by day. Moreover, due to huge population growth the demand for water is rising especially in agricultural, industries and for municipal uses. So, to meet the rising water demand, reservoirs are constructed in different parts of the country to store water during monsoon and supply it throughout the year according to the demand. The reservoir is also constructed for controlling the peak of high flood which is quite common in many places. The Dwarakeswar River in the district of Bankura in the State of West Bengal has only seasonal flow of water. In order to meet the agricultural and municipal water requirement throughout the year and also for controlling the flood, it has been proposed to construct a reservoir at Suknibasa on the river near Bankura Town. The analysis of the performance of this reservoir for meeting various demands (under historical as well as projected scenario) as well as its capability for moderating flood has been reported in the present paper. The projected scenario involves the modeling of streamflow for future time frame using the Thomas-Fiering method and the flood moderation analysis involves the estimation of design flood hydrograph for the river at Suknibasa. The study reveals that the Suknibasa reservoir is capable of meeting all demands and moderating flood for which it has been proposed to be constructed.

Journal of Agricultural …, 2006

Daily rainfall data of 21 years (from 1983 to 2003) for Bankura district of West Bengal were anal... more Daily rainfall data of 21 years (from 1983 to 2003) for Bankura district of West Bengal were analyzed to ascertain their fit to several probability distributions. The series generated by using Weibull's plotting position formula was treated as the Observed series. ...

Applied Water Science, Oct 19, 2016

The work addressed here determines an appropriate strategy for operating a system of four multipu... more The work addressed here determines an appropriate strategy for operating a system of four multipurpose and one single purpose reser voirs managed by the Damodar Valley Corporation (DVC) which is partially completed and located in eastern India. The performance of the system to meet the various demands in the basin and the degree of their dependability have been determined using

CLEAN - Soil, Air, Water, 2015

Applied Water Science, 2011

Traditional techniques for estimation of flood using historical rainfall-runoff data are restrict... more Traditional techniques for estimation of flood using historical rainfall-runoff data are restricted in application for small basins due to poor stream gauging network. To overcome such difficulties, various techniques including those involving the morphologic details of the ungauged basin have been evolved. The geomorphologic instantaneous unit hydrograph method belongs to the latter approach. In this study, a gamma geomorphologic instantaneous unit hydrograph (GGIUH) model (based on geomorphologic characteristics of the basin and the Nash instantaneous unit hydrograph model) was calibrated and validated for prediction of direct runoff (flood) from the catchment of the Dulung-Nala (a tributary of the Subarnarekha River System) at Phekoghat station in the state of West Bengal in the eastern part of India. Sensitivity analysis revealed that a change in the model parameters viz., n, R A and R B by 1-20% resulted in the peak discharge to vary from 1.1 to 27.2%, 3.4 to 21.2% and 3.4 to 21.6%, respectively, and the runoff volume to vary from 0.3 to 12.5%, 2.1 to 2.6% and 2.2 to 2.7%, respectively. The Nash-Sutcliffe model efficiency criterion, percentage error in volume, the percentage error in peak, and net difference of observed and simulated time to peak which were used for performance evaluation, have been found to range from 74.2 to 95.1%, 2.9 to 20.9%, 0.1 to 20.8% and -1 to 3 h, respectively, indicating a good performance of the GGIUH model for prediction of runoff hydrograph. Again, an artificial neural network (ANN) model was prepared to predict ordinates of discharge hydrograph using calibrative approach. Both the ANN and GGIUH models were found to have predicted the hydrograph characteristics in a satisfactory manner. Further, direct surface runoff hydrographs computed using the GGIUH model at two map scales (viz. 1:50,000 and 1:250,000) were found to yield comparable results for the two map scales. For a final clarification, the probability density function of the actual and predicted data from the two models was prepared to compare the pattern identification ability of both the models. The GGIUH model was found to identify the distribution pattern better than the ANN model, although both the models were found to be ably replicating the data patterns of the observed dataset.

Impact of Climate Change on Natural Resource Management, 2010

Chapter 7 Determination of Urbanization Impact on Rain Water Quality with the Help of Water Quali... more Chapter 7 Determination of Urbanization Impact on Rain Water Quality with the Help of Water Quality Index and Urbanization Index Sanjib Das, Mrinmoy Majumder, Debasri Roy1 and Asis Mazumdar Abstract Rain water quality is a vital factor for deciding whether the water is ...

ABSTRACT The HEC-HMS model (Hydrologic Modeling System), developed by the Hydrologic Engineering ... more ABSTRACT The HEC-HMS model (Hydrologic Modeling System), developed by the Hydrologic Engineering Center, USA (HEC) was evaluated for its applicability for the Damodar river basin in eastern India. Sensitivity analysis of the model was carried out for the input parameters. The study revealed that both the peak discharge and runoff volumes to be sensitive to rate of infiltration and percentage of impervious area. The Nash-Sutcliffe model efficiency criterion, percentage error in volume, the percentage error in peak and net difference of observed and simulated time to peak, were used for performance evaluation. The model demonstrated good performance, with aforementioned performance indices values ranging from 75-81%, -10.5-19.4%, -18.0-29.6% and 0-1 day for simulation of stream flow. Thus the model may be successfully applied to watersheds in the Damodar river basin.

ABSTRACT Hydro power is recognized as a renewable source of energy, which is economical, nonpollu... more ABSTRACT Hydro power is recognized as a renewable source of energy, which is economical, nonpolluting and environmentally benign. Small and mini hydel projects have the potential to provide energy in remote and hilly areas where extension of grid system is uneconomical. In this background, a hydel power project has been proposed to be constructed by Bihar State Hydroelectric Power Corporation Limited, Government of Bihar Enterprise, India on Tiljuga Dhar (a tributary of Kosi River flowing from Nepal) at Nirmali near Hariyahi village of Supaul district in the State of Bihar in India. The basic infrastructural need of this hilly terrain is environment friendly source of power which will accelerate the development of agrobased industries and arrest exodus of people in search of livelihood and would also control insurgency. The present work reports the feasibility analysis of the aforementioned hydel project. It has been found that if a dam, having 41 years of estimated reservoir life period, with a storage capacity of 7.05 MCM be constructed across Tijuga Dhar at Nirmali, a set of three hydel units with capacity of 610, 180 and 81 kW may be run in unison or alternately to generate power of 4.88 MW per annum.

ABSTRACT Assessment of impact of climate change on water resources in river basin requires a prop... more ABSTRACT Assessment of impact of climate change on water resources in river basin requires a proper estimation of availability of water and that can only be achieved by hydrological modeling of the basin. However, hydrological modeling is a complex task and hydrologic models should be well calibrated to increase user confidence in its predictive ability which makes the application of the model effective. In this study a catchment simulation model viz., Hydrologic Modeling System, developed by the Hydrologic Engineering Center, USA (HEC-HMS) (with soil moisture accounting algorithm -- SMA) has been calibrated and validated for Subarnarekha river basin in Eastern India for prediction of its hydrologic response. The analysis shows that the soil storage, tension zone storage and groundwater 1 storage coefficient to be the sensitive parameters for the simulated stream flow. The Nash - Sutcliffe model efficiency criterion, percentage error in volume, the percentage error in peak, and net difference of observed and simulated time to peak, which were used for performance evaluation, have been found to range from (0.72 to 0.84), (4.39 to 19.47%), (1.9 to 19%) and (0 to 1day) respectively, indicating a good performance of the model for simulation of stream flow and thereby quantification of available water. The study also demonstrates that the use of semi annual parameter sets that account for changing hydrologic conditions improves model performance. Thus the model may be applied to other watersheds in the Subarnarekha river basin and other hydro -meteorologically similar river basins.