Erosion risk assessment:A contribution for conservation priority area identification in the sub-basin of Lake Tana,north-western Ethiopia

作     者：Daniel Asfaw Bekele Getachew Workineh Gella Mulualem Asfaw Ejigu Daniel Asfaw Bekele;Getachew Workineh Gella;Mulualem Asfaw Ejigu

作者机构：Department of Geography and Environmental StudiesBahir Dar UniversityEthiopia Geospatial Data and Technology Center(GDTC)Bair Dar UniversityEthiopia Department of Geography and Environmental StudiesDebre Tabor UniversityEthiopia 

出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)

年 卷 期：2022年第10卷第1期

页      面：46-61页

核心收录：

学科分类：082802[工学-农业水土工程] 0907[农学-林学] 08[工学] 09[农学] 0710[理学-生物学] 090707[农学-水土保持与荒漠化防治] 0828[工学-农业工程] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0815[工学-水利工程] 0901[农学-作物学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

主　　题：Phrases Erosion Sediment yield Landscape GIS Cumara watershed 

摘      要：Soil erosion is a serious environmental problem arising from agricultural intensification and landscape *** land management coupled with intense rainfall has intricated the problem in most parts of the Ethiopian *** loss costs a profound amount of the national ***,quantifying soil loss and prioritizing areas for conservation is imperative for proper planning and resource ***,this study has modeled the mean soil loss and annual sediment yield of the Gumara *** 5 TM,Landsat 7ETM+,and Landsat 8 OLI were used for land use land cover(LULC)change *** these,other datasets related to rainfall,digital soil map,Digital Elevation Model,reference land use,and cover(LULC)ground truth points were used to generate parameters for modeling soil *** watershed was classified into five major land-use classes(water body,cultivated land,grazing land,built-up and forest and plantation)using a maximum likelihood algorithm covering a period of the last 30 years(1988-2019).The mean annual soil loss and sediment yield were quantified using RUSLE,Sediment delivery ratio(SDR),and Sediment Yields models(SY).The analysis result unveils that within the past 30 years,the watershed has undergone significant LULC changes from forest&plantation(46.33%)and grazing land to cultivated land(31.59%)with the rate of-1.42km^(2)yr^(-1) and-2.80km^(2)yr^(-1) *** the same vein,the built-up area has expanded to cultivated and grazing ***,nearly 15%(207 km2)of the watershed suffered from moderate to very severe soil *** average,the watershed losses 24.2t ha^(-1) yr^(-1) of soil and yields 2807.02t ha^(-1) yr^(-1) ***,the watershed losses 385,157t ha^(-1)yr^(-1) soil from the whole study *** the admir-ative districts,Farta(Askuma,Giribi,Mahidere Mariam and Arigo kebeles),Fogera(Gazen Aridafofota and Gura Amba kebeles),East Este(Witimera kebele),and Dera(Gedame Eyesus and Deriana Wechi