Development of Alluvial Fans and Associated Land Use Problems of Himalayan Foot Hills, West Bengal

Abstract

The present paper embodies some observations and distinct findings about the Development Of Alluvial Fans And Associated Land Use Problems Of Himalayan Foot Hills,Werst Bengal.The study area give an ample scope for studying the evaluation and developmental striates of alluvial fans being originated by fluvial action.The present worker have taken 1000km2 area, demarcated by Tista nd Jaldhaka including no. of rivers,streams. Actually a mountain stream debouching out onto a flat,gentle gradient deposits its load building the alluvial fans. Fan development is are result of complex interaction of climate and tectonism being influenced by open hydrological system.According to Bull(1964) fan materials are classified by Mud flow, Braided stream flow and stream channel flow among which stream channel flow is responsible for the development of alluvial fans over this area.This fan areas are also marked by variabilities of land use mainly agriculture is well developed over the fertile alluvial deposits on which soil layers have prominently developed. The gentle sloped cultivated plots are mainly suffered by proper irrigation, mainly in rabi season. The EW demarcating zone of 250m contour line between Bhabar and Khadar ,due to the presence of HFF water is percolated and in the downstream area they are come out as capillary action. side this reason the soil character is also responsible. So proper land use management and well irrigation system is needed for agriculture.