Assessments of potential ecological impacts of climatic parameters on non-point source (NPS) pollutants at local and regional scales are necessary as a basis for effective management strategies to protect precious resources such as land and water. Intensive watershed scale study is therefore necessary to identify and prioritise the critical areas in the agricultural watershed to develop management strategies for abating soil erosion. The major goal of the present study was to analyse climatic parameters and to identify the critical areas of an agricultural watershed using a physical process based watershed scale model, soil water assessment tool (AVSWAT-X). A 973 ha agricultural watershed located in Midnapore district of West Bengal state in eastern India was monitored to quantify the hydrologic parameters such as runoff, and sediment yield. The model was calibrated and validated using observed hydrologic and sediment yield data of the watershed monitored during the rainy seasons of 2002 to 2005, respectively. Besides these data, micro-meteorological data, topographical map, soil map, land resources data and remote sensing data (satellite imagery) of the watershed were used as input to the model. The study revealed that AVSWAT-X model simulates daily runoff and daily sediment yield satisfactorily throughout the entire rainy season, as evident from standard statistical tests. The calibrated model was then successfully used for identifying the critical sub-watersheds for future development of best management practices. The study revealed that among climatic parameters rainfall with frequent extreme events has most prominent influence on runoff and sediment yield from the watershed. Due to these extreme rainfall events sediment yield has increased from slight soil erosion class to high erosion class and also affected the prioritisation of critical sub-watershed for conservation treatment keeping in mind future climate scenario.
|Keywords:||Climate, Hydrological Modelling, AVSWAT-X, Sediment, Runoff|
Research Scholar, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
Professor, Agricultural and Food Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
Professor and Head, Department of Soil Science and Land Evaluation, Biogeophysics Section, University of Hohenheim, Stuttgart, Germany
Lecturer, Department of Soil Science and Land Evaluation, Biogeophysics Section, University of Hohenheim, Stuttgart, Germany
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