Watershed Prioritization of Palar Sub-watershed Based on the Morphometric and Land Use Analysis  

作　　者：Evangelin Ramani SUJATHA Radhakrishnan SELVAKUMAR Balasubramaniam RAJASIMMAN 

机构地区：[1]School of Civil Engineering, SASTRA University, Thanjavur 613 401,Tamilnadu, India [2]Centre for Remote Sensing, Bharathidasan University,Tiruchirapalli 620003, India

出　　处：《Journal of Mountain Science》2014年第4期906-916,共11页山地科学学报（英文）

摘　　要：Morphometric analysis is an indispensable tool for hydrological investigation that involves the development and management of drainage basin. This study characterizes the micro watersheds in the Palar sub-watershed using morphometric analysis and assesses its risk by land use and land cover features in a particular micro watershed. Palar sub-watershed is divided into 6 micro watersheds for prioritization based on morphometric and land use analysis. Several morphometric parameters （linear, shape and relief） are determined from the drainage map; ranks are assigned based on their capacity to induce erodability and degradation. Final ranking is based on the composite index calculated from the sum of the ranks of each morphometric parameter. Morphometric analysis reveals micro watersheds 5 and 6 as most susceptible and 2 and 3 as low susceptible. Land use is mapped using IRS ID LISS III satellite data. The risk in terms of watershed degradation involved to each micro watershed is based on the ranks of each land use feature, obtained from a similar composite index as that of morphometric analysis. Land use analysis shows that micro watersheds 2 and 4 fall under high priority category while 5 and 6 under low priority category. Integration of the morphometric and land use analysis shows that only microwatershed 1 falls under the same category in both analyses. Control measures are suggested to contain degradation depending on its specific land use pattern and morphometric features. This study ean be used to prepare a comprehensive watershed plan for the development or for planning resource conservation strategies, by integrating land use features with the drainage characteristics of the region, in particular for a hill ecosystem as the prioritization is at micro level.

关 键 词：Morphometric analysis Watersheddeterioration risk Land use Palar sub-watershed Kodaikkkanal 

分 类 号：P331[天文地球—水文科学] P343.9[水利工程—水文学及水资源]