An Investigation into Sub-Basin Rainfall Losses in Different Underlying Surface Conditions Using HEC-HMS: A Case Study of a Loess Hilly Region in Gedong Basin in the Western Shanxi Province of China

Abstract

Abstract:Basins located in loess hilly-gully regions often suffer flood disasters during the flood season. Meanwhile, the underlying surface of the region can increase the rainfall losses, thereby reducing the flood volume. Therefore, the prediction of rainfall losses on the underlying surface is necessary for scientifically and reasonably forecasting the flood volume. The relationship between the rainfall losses and underlying characteristics was investigated and a method for predicting the rainfall losses using HEC-HMS was presented in this paper with a case study in the Gedong basin, a typical loess hilly region of western Shanxi Province in northern China. Results showed that HEC-HMS could be applied to loess hilly-gully regions. The loss computation results suggested that the losses of sub-basins varied with the density of rainfall. The analysis of influences of rainfall losses, including forestland percentage and slope, indicated that the former had a positive impact, while the latter had a negative influence. The impact of forestland percentage is larger than that of slope. Furthermore, with the increase of forestland percentage, its correlation with rainfall losses was enhanced, and the correlation coefficient ranged between 0.64 and 0.84 from the 1970s to the 2010s.

Study on the mechanism and control of strong ground pressure in the mining of shallow buried close-distance coal seam passing through the loess hilly region

“…Due to the influence of LHA on the surface, it is a typical gully terrain, and the peak-valley drop of some gully slopes reaches 20 ~ 50 m. In the valley, not only the loose topsoil layer is missing due to erosion, but also some bedrock is missing. The drop of the LHA is 30 ~ 70 m, and the thickness of the surface load increases [4,5]. The mining practice shows that the working face of SBCCS is easily affected by the LHA during the mining process, which leads to the short time of weighting in the stope and the large damage, and the weighting is greater than the weighting of the conventional mining face.…”

Simulation of overflow thresholds in urban basins: Case study in Tuxtla Gutiérrez, Mexico

“…Hec-Ras (Larios, Torres, Quevedo, Martínez, & Salgado, 2015;Ruiz-Bellet, Castelltort, Balasch, & Tuset, 2017), Hec-Hms (Juárez, Ibáñez, Pérez, & Arellano, 2009;Ren et al, 2017), Infoworks 2D (Falter et al, 2013;Hurford et al, 2010;Mundo, 2012;Roca & Davison, 2010) and the permanent-flow simulation program of the Autonomous University of Mexico (Aragón, 2007). Recently, the possibilities of the Iber 2D model (open-source software) have been explored, which allows 2-dimensional hydraulic simulation and also has a hydrological module (Bladé et al, 2014a(Bladé et al, , 2014b.…”