Research on the application of comprehensive unit lines in highly urbanized watersheds in Guangdong Province
In order to solve the problem of low accuracy in comprehensive unit line calculation of watershed floods in Guangdong Province under the background of rapid urbanization,taking Guanlan River Basin in Shenzhen as the research object,this articleproposeda unit line parameter correction methodby analyzing the applicability of existing unit line parame-ters for watershed flood calculation and combining with the characteristics of watershed flood convergence process under multiple typical rainfall conditions.Based on the river hydrodynamic model,it further teststhe flood calculation results.The results show that:(1)The measured peak time of floods in the Guanlan River Basin is within 2 hours,while the current unit line method for calculating flood flow is relatively small,with a peak time of 5 hours,which cannot accurately reflect the characteristics of flood confluence in the basin;(2)After adjusting the convergence parameter m1,the flood flow rate increased and the peak occurrence time advanced.The absolute error between the simulated and measured water levels at important sections was less than 0.05 m,and the peak occurrence time was consistent.The flood calculation results were reasonable,and the reliability of the revised unit line was higher.The research results have significant application value and can provide reference for flood analysis and research in highly urbanized watersheds.
highly urbanizationcomprehensive unit line of Guangdongparameter modificationGuanlan River Basin
万方数据
维普
