Open AccessAnalysis of Landslides Stability Influenced by the Heavy Rainfall and Drawdown of Reservoir Water Level in Three Gorges Reservoir
Author(s) -
Yi Liu,
Boming Zhao,
Xianghao Kong,
Zhi Yang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/719/4/042031
Subject(s) - drawdown (hydrology) , three gorges , landslide , hydrology (agriculture) , water level , flood myth , environmental science , stability (learning theory) , geology , geotechnical engineering , groundwater , geography , aquifer , cartography , archaeology , machine learning , computer science
Heavy rainfall and reservoir drawdown rate are primary factors when evaluating landslide stability. This paper intends to ensure the feasibility of increasing reservoir drawdown rate before flood season influenced by those two factors in the Three Gorges Reservoir (TGR) area. At first, a heavy rainfall was calculated by Pearson type ? distribution (PE3) using rainfall data of 20 counties from 1960 to 2010. Based on the reservoir operation, annual rainfall data was divided into four groups and calculated separately. The parameters of PE3 were estimated by curve fitting method and validated by Kolmogorov-Smirnov test. Then a reservoir drawdown model was proposed considering the actual regulation of reservoir. At last, a seepage-slope analysis was carried out using extreme rainfall and reservoir drawdown model on Sifangbai landslide. The extreme rainfall results show that the extreme rainfall during flood season was 2.5, 1.4 and 2.2 times greater than that in other three parts. Stability analysis showed that the landslide stability was mainly influenced by reservoir drawdown. Total time and elevation in rapid drawdown model would reduce with the increase of reservoir drawdown rate. With extreme rainfall data and reservoir drawdown model provided in this paper, similar partially submerged landslides in the TGR can be evaluated before increasing reservoir drawdown rate.