Analysis of the Critical Areal Rainfall For Flash Floods in the Basin of Dajing River in Gaoyao,Zhaoqing
YUAN Ye-rong
ZHOU Yi-chang
Abstract：Based on the data of Digital Elevation Model(DEM),fundamental geographic information system and rainfall and with the FloodArea submergence model,this work simulated and verified a flash flood in the northwest of Gaoyao,Zhaoqing caused by an unusually heavy rain on June 8,2018.In the stud-y,a rain-flood relationship model was set up for a weather station at the town of Shuinan,the disaster warn-ing site,and critical flash-flood-causing rainfall was determined to support services against relevant risks in the district.The results are shown as follows.For the process of interest,the modeled water depth has a de-viation of 0.22 m from the observed one,suggesting satisfactory results.Then,the SPSS software was used to run a correlation analysis and set up a regression model between accumulated rainfall at 1,2,3,4,5,and 6 h and modeled depth of submergence.The work concluded that the 2-h critical rainfall for four risk levels of flash flood in the basin of Dajing River is 198.7 mm(Level 1),136.5 mm(Level 2),74.3 mm(Level 3),and 32.9 mm(Level 4),respectively.
Keywords：synopticsFloodArea submergence modelcritical areal rainfallflash floodGaoyao dis-trictZhaoqing
Publication Date：2023-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 39-42 )