Author(s): Jing Huang; Yehongping Qin; Zejun Li; Chao Tan; Jiqing Li And Ningning Li
Linked Author(s): Jing Huang
Keywords: Inflow flood identification representative flood hydrograph design flood improved peak-over threshold method (IPOT) application of inconsistency time series
Abstract: The inflow flood is a prerequisite for the reservoir operation and water resource allocation in a watershed. In response to the long-standing problem of manually selecting typical year, an inflow flood identification model is established based on the Kolmogorov-Smirnov test, improved peak-over threshold method, and Poisson with time-varying parameters model. It aims to achieve the transformation of inconsistency measured data to independent identical distribution samples, and to autonomously identify and calculate representative hydrograph of inflow flood. The Jinxia Reservoir Group (JRG), which consist of Wudongde, Baihetan, Xiangjiaba, and Xiluodu reservoirs in the lower Jinsha River, are used as a case study. The results show that the inflow flood time series of the JRG has two consistency change points, namely 1998 and 2002. There are 6 and 7 representative hydrographs in the flood peak and 3-day flood volume series, with a predominantly belongs to short-fat and multi-peak types. The maximum storage capacity difference for inflow floods with the same design frequency (P = 1%) but different hydrographs is 5.783 billion m3, accounting for 37.33% of the total flood control storage of JRG. Accurately identifying representative hydrographs of inflow flood contribute to optimize the allocation of water resources and storage capacity in the watershed, and is crucial for enhancing the resilience of watersheds against flood and drought disasters in changing environments.
Year: 2025