EFFECTS OF RAINFALL AND WATER LEVEL ON THE STABILITY OF THE BAU TRANG LAKE BANK, BAC BINH DISTRICT, BINH THUAN PROVINCE, VIETNAM

Ngoc Thinh Pham, Thi Mai Suong Nguyen, Van Phu Dang

Abstract


Introduction. This study evaluates the impact of lake water levels, rainfall, and the presence of small pits on the stability of the banks of Bau Trang Lake, a national scenic site in Binh Thuan Province, Vietnam. Methods. To assess the slope stability safety factor, several scenarios were simulated using GeoStudio 2024 software with the SEEP/W and SLOPE/W modules. Results. With a safety factor reduction of less than 1%, the results show that the small pit has a minimal effect on lake bank stability. The lake water level plays a critical role: low water levels increase the likelihood of instability, whereas high water levels enhance stability and lower pore water pressure. Particularly when combined with low water levels, intense or prolonged rainfall significantly decreases the safety factor by increasing soil saturation and reducing shear strength. The study recommends maintaining stable water levels, reinforcing high-risk areas, and implementing effective drainage systems to mitigate the effects of rainfall. These findings provide a scientific basis for sustainable management strategies to preserve the environment and landscape of Bau Trang Lake, and guide future research on shoreline stability under geological and climatic influences.

Keywords


Bau Trang Lake; slope stability; lake level; rainfall; GeoStudio

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