Simulation and Analysis of Event-based Rainfall in the Yiluo River Basin Based on the WRF Model

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Simulation and Analysis of Event-based Rainfall in the Yiluo River Basin Based on the WRF Model

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[1]TAO Jie,ZHOU Xiangyu,LI Jinjing,et al.Simulation and Analysis of Event-based Rainfall in the Yiluo River Basin Based on the WRF Model[J].Journal of Zhengzhou University (Engineering Science),2027,48(XX):1-8.[doi:10.13705/j.issn.1671-6833.2027.01.007]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 48 Number of periods: 2027 XX Page number: 1-8 Column: Public date: 2027-12-10

Title:: Simulation and Analysis of Event-based Rainfall in the Yiluo River Basin Based on the WRF Model

Author(s):: TAO Jie^1,2, ZHOU Xiangyu¹, LI Jinjing^3,4, ZHAO Qijia¹; 1. School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China; 2. Henan International Joint Laboratory of Water Cycle Simulation and Environmental Protect, Zhengzhou 450001, China; 3. Yellow River Water Resources Center, Yellow River Conservancy Commission, Zhengzhou, 45003, China; 4. Yellow River Institute, North China University of Water Resources and Electric Power, Zhengzhou 450046, China

Keywords:: WRF model; rainfall simulation; microphysics scheme; land-surface update; Yiluo River basin

CLC:: P426.6；P456.7

DOI:: 10.13705/j.issn.1671-6833.2027.01.007

Abstract:: To address the limited studies on event-based rainfall simulation, the applicability of microphysicsschemes, and the hourly evolution of rainfall processes in the Yiluo River basin, where complex topography and pronounced spatial variability of rainfall pose challenges to rainfall simulation, five typical rainfall events during2021-2024 were simulated using the Weather Research and Forecasting ( WRF) model. The FNL data from theGlobal Data Assimilation System (GDAS) were used as the initial boundary conditions to evaluate the effects of different microphysics schemes and land-surface conditions on typical rainfall processes. The results showed that theWRF model reasonably reproduced the spatiotemporal distribution characteristics of event-based rainfall in the YiluoRiver basin. However, the five microphysics schemes, namely Kessler, Lin, WSM6, Thompson, and Eta, still exhibited certain deviations in simulating the locations and accumulated rainfall of rainfall centers, basin-mean rainfall, the spatial distribution of accumulated rainfall, and the hourly evolution of rainfall processes. The accumulatedrainfall at rainfall centers and basin-mean rainfall were generally overestimated. Among the five schemes, the Etascheme showed relatively stable overall performance. After the land-surface data were updated, the simulated accumulated rainfall at the rainfall centers decreased by approximately 6% overall, and the simulations of rainfall centers and the spatiotemporal evolution of rainfall processes were significantly improved.

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