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Torrential Flood Water Management: Rainwater Harvesting through Relation Based Dam Suitability Analysis and Quantification of Erosion Potential
ISPRS International Journal of Geo-Information ( IF 3.4 ) Pub Date : 2021-01-12 , DOI: 10.3390/ijgi10010027
Bilal Ahmad Munir , Sajid Rashid Ahmad , Raja Rehan

In this study, a relation-based dam suitability analysis (RDSA) technique is developed to identify the most suitable sites for dams. The methodology focused on a group of the most important parameters/indicators (stream order, terrain roughness index, slope, multiresolution valley bottom flatness index, closed depression, valley depth, and downslope gradient difference) and their relation to the dam wall and reservoir suitability. Quantitative assessment results in an elevation-area-capacity (EAC) curve substantiating the capacity determination of selected sites. The methodology also incorporates the estimation of soil erosion (SE) using the Revised Universal Soil Loss Equation (RUSLE) model and sediment yield at the selected dam sites. The RDSA technique identifies two suitable dam sites (A and B) with a maximum collective capacity of approximately 1202 million m3. The RDSA technique was validated with the existing dam, Gomal-Zam, in the north of Sanghar catchment, where RDSA classified the Gomal-Zam Dam in a very high suitability class. The SE estimates show an average of 75 t-ha−1y−1 of soil loss occurs in the study area. The result shows approximately 298,073 and 318,000 tons of annual average sediment yield (SY) will feed the dam A and B respectively. The SE-based sediment yield substantiates the approximate life of Dam-A and Dam-B to be 87 and 90 years, respectively. The approach is dynamic and can be applied for any other location globally for dam site selection and SE estimation.

中文翻译:

洪灾洪水管理:通过基于关系的大坝适宜性分析和侵蚀潜力量化来收集雨水

在这项研究中,开发了一种基于关系的大坝适宜性分析(RDSA)技术来确定最适合的大坝站点。该方法论着重于一组最重要的参数/指标(河流顺序,地形粗糙度指数,坡度,多分辨率谷底平坦度指数,闭合凹陷,谷深和下坡梯度差)及其与坝壁和水库适宜性的关系。 。定量评估得出高程容量(EAC)曲线,证实了选定站点的容量确定。该方法还包括使用修订的通用土壤流失方程(RUSLE)模型和选定大坝站点的泥沙产量估算土壤侵蚀(SE)。3。RDSA技术已在Sanghar流域北部的现有大坝Gomal-Zam进行了验证,RDSA在此将Gomal-Zam大坝分类为非常高的适用性等级。SE估计值表明研究区域平均发生了75 t-ha -1 y -1的土壤流失。结果表明,大约298,073和318,000吨的年平均沉积物产量(SY)将分别为A和B大坝供水。基于SE的沉积物产量证实了Dam-A和Dam-B的大约寿命分别为87年和90年。该方法是动态的,可以在全球范围内应用于其他任何位置,以进行坝址选择和SE估算。
更新日期:2021-01-12
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