Physical and Geomorphologic Characteristics Based Sediment Production Analysis of a Semi-arid Watershed in Eastern India
摘要
A watershed is a natural hydrological entity that allows surface run-off into a defined drain, channel, stream, or river. Soil erosion poses a severe hazard to people living in the watershed and the hazard is more severe in arid and semi-arid areas, particularly on grazing land. Watershed management is a major challenge in India to protect soil and water resources. The average soil loss rate in India is 16.75 mm per year. To identify which watersheds should receive priority attention and to implement soil and water conservation measures based on physical characteristics such as channel length, channel network configuration, watershed slope, and drainage divide location as well as geomorphologic characteristics such as shape factor, bifurcation ratio, circulatory ratio, drainage density, relative relief and hypsometric integral (HI) based equations are frequently used. This research examined the potential rate of soil erosion and sediment production about the morphometric features of the Tel River basin, a semi-arid watershed located in Eastern India. The sediment production rate of the Tel River basin was estimated by gathering data on key parameters such as precipitation, topography, land use, and soil type over ten years. A sediment yield equation based on sediment load, drainage area, precipitation, slope, and soil erodibility factor were used to estimate the sediment production rate, which varied depending on the time of year and weather conditions. It is important to collect high-resolution digital data for the key parameters over a longer period to increase the accuracy of estimation.