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Developing an overall assessment map for flood hazard on large area watershed using multi-method approach: case study of Wadi Qena watershed, Egypt

机译：使用多方法方法制定大型地区流域洪水危害的整体评估图：埃及瓦迪Qena流域的案例研究

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摘要

Many parts of Upper Egypt as Sinai and Red Sea areas were hit by severe flash floods since 1976. Wadi Qena is considered one of the most watersheds that suffers from floods in Red Sea area. It was recorded by the General Authority for Roads, Bridges & Land Transport (GARBLT) that the flash flood destructive effect always occurs on El-Geesh-Hurghada Road which is located in the southern part of Wadi Qena watershed. The current study investigates the assessment of endangered areas in Wadi Qena watershed based on a suggested concept of multi-method approach which is a combination of morphometric ranking method and El-Shamy approach. The morphometric analysis is applied using set of parameters which are classified into three categories: basin geometry, drainage network and texture, and relief parameters. For basin geometry, the considered parameters are the watershed area (A), elongation ratio (Re), circularity ratio (Rc), form factor (Ff), and compactness coefficient (Cc). For drainage network and texture parameters, stream frequency (F), texture ratio (Rt), length of overland flow (Lo), and drainage density (D) parameters are considered. For relief parameters, the parameters are mean basin slope (Sm), relief ratio (Rr), and ruggedness number (Rn). A filtration process for the above twelve parameters is considered for reducing the number of parameters by omitting the parameters which have inverse effect on the flood severity of the study area. It is concluded that six parameters have a direct effect on sub-basin hazardous including A, D, Lo, Sm, Rr, and Rn. Sensitivity analysis is concerned for ranking the selected parameters by their significant parameters in assessing the most hazard sub-basins. An overall assessment map is constructed showing the hazard degrees of the sub-basins. The constructed map concludes that the sub-basins are divided into moderate and high hazard ones. Moreover, the results show that the high hazard degree sub-basins are concentrated in the middle and east of the watershed with a percentage of 18.5% of the total area. The developed overall assessment map can be used for assessment and mentoring processes of flood mitigation and planning.
机译：自1976年以来，由于西奈和红海地区的许多部分是西奈和红海地区受到严重的闪光洪水。瓦迪Qena被认为是红海地区洪水洪水的最大分水岭之一。它被道路，桥梁＆amp的总督记录;陆地运输（Garblt）闪现洪水破坏性效果始终发生在埃尔 - 赫尔格达路，位于Wadi Qena流域南部的南部。目前的研究根据建议的多种方法方法概念调查了瓦迪QENA流域濒危地区的评估，这是形态测量法和紫色方法的组合。使用归类为三类：盆地几何，排水网络和纹理以及浮雕参数的一组参数来应用。对于盆地几何形状，所考虑的参数是流域区域（A），伸长率（RE），圆形比（RC），外形（FF）和紧凑性系数（CC）。对于排水网络和纹理参数，流频率（F），纹理比（RT），陆孔流量（LO）和排水密度（D）参数。对于浮雕参数，参数是平均盆斜率（SM），浮雕比（RR）和坚固性数（RN）。通过省略对研究区域的洪水严重程度具有反向影响的参数，考虑用于降低参数数量的上述12个参数的过滤过程。结论是，六个参数对亚盆地危险的直接影响，包括A，D，LO，SM，RR和RN。敏感性分析涉及通过它们在评估最大危险子盆地的重要参数来排序所选参数。构建了整体评估图，显示了子盆地的危险度。所构建的地图的结论是，子盆地分为中等和高危险。此外，结果表明，高灾害度亚盆地集中在流域中东，占总面积的18.5％的百分比。发达的整体评估地图可用于评估和辅导洪水缓解和规划过程。

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