长江科学院院报2018，Vol.35Issue(1)：57-62,6.DOI:10.11988/ckyyb.20160943
基于流量-面积比值的小流域设计洪水计算方法对比研究
Comparison of Calculation Methods for Design Flood of Small Catchments Based on Flow-Area Ratio
摘要
Abstract
The design flood in a mountainous small catchment was calculated by using distributed model,regional instantaneous unit hydrograph,and deducted formula respectively based on the ratio of peak discharge to catchmentarea,and the calculated results were further compared with the measured peak discharge of 100-year flood to determine the applicability of the above-mentioned three methods.Puhe river system in Qijiang,Chongqing was selected as a case study.Conclusions are drawn as follows:1) deducted formula is more accurate and reliable for catchment with an area smaller than 10 km2 as steep river slope makes the runoff yield and concentration condition consistent with the assumption of the deducted formula;2) distributed model and regional instantaneous unit hydrograph are both applicable to catchment with an area between 10-100 km2,with the result of the former closer to measured result;in such catchment of long channel and gentle slope,the hydrodynamic dispersion can be regarded as uniform diffusion in space,and the computation grid units are strongly continuous,well reflecting the real design flood process;3) distributed model is recommended as the preferred method when catchment area is larger than 100 km2,as it deviates to the smallest extent to the measured value among the three methods.The conclusions will be helpful to the selection of a reasonable calculation method.关键词
山洪灾害/设计洪水/分布式模型法/地区瞬时单位线法/推理公式法Key words
mountain flood disaster/design flood/distributed model/regional instantaneous unit hydrograph/deducted formula分类
天文与地球科学引用本文复制引用
幸新涪,周火明,秦维,谭昭娣,卢宇,张乾柱,卢阳..基于流量-面积比值的小流域设计洪水计算方法对比研究[J].长江科学院院报,2018,35(1):57-62,6.基金项目
中央级公益性科研院所基本科研业务费专项项目(CKSF2016034/CQ) （CKSF2016034/CQ）
