Study on safety monitoring and risk warning method of the near-basin reservoir bank slope

Abstract

Once the near-dam reservoir bank slope becomes unstable and collapses, it will inevitably have a significant impact on the adjacent hydraulic structures and the surrounding environment. Conducting safety monitoring and risk early warning for the near-dam reservoir bank slope after instability and failure is of great significance for ensuring the safe operation of hydraulic structures. Therefore, this paper proposes a set of safety monitoring and risk early warning method for the near-dam reservoir bank slope. Deformation monitoring quantities, their deformation rates, and the safety factor of the slope are selected as the key monitoring indicators for the safety of the near-dam reservoir bank slope. A monitoring classification standard of "three-level early warning(normal, mild abnormal, abnormal) + one-level emergency" is established. An overall safety early warning index for the near-dam reservoir bank slope based on the Copula function and the fusion of multi-point displacement monitoring information is constructed. Based on the analysis of landslide-induced waves, relying on the relationship between the landslide volume and the wave height in front of the dam and the allowable wave height of the automatic regulation output system of the hydropower station, a risk classification and early warning level for the operation and dispatching of the hydropower station after the instability and failure of the near-dam reservoir bank slope is established. This method not only considers the safety monitoring issues of the near-dam reservoir bank slope itself, but also takes into account the downgrading and down-classification of the landslide-induced wave risk during the transmission process after the slope instability and failure. It can provide reference and guidance for the safety monitoring and risk early warning of the near-dam reservoir bank slope.

Keywords

near-dam reservoir bank / slope / landslide-induced waves / safety monitoring / risk early warning