應用二十四小時頻率雨量推估集水區暴雨逕流歷線

Estimating Watershed Stormflow Hydrographs from 24-hour Rainfall Frequency Data

盧惠生(Hui-Sheng Lu)

《林業試驗所研究報告季刊》 9卷4期 (1994/12) Pp. 363-373

https://doi.org/10.7075/BTFRI.199412.0363

摘要

本文以畢祿溪11號集水區24小時最大暴雨雨型分配歷線，採用美國土壤保育局之逕流曲線指數法，推估超滲雨量，再以三角單位歷線法，計算不同頻率年暴雨逕流歷線。根據推估之暴雨逕流歷線分析，洪峰流量，暴雨流出量及集流時間等特性，頗為可靠。所需輸入資料甚為簡易，僅需日雨量、少量之地形數據、坡面流速與CN值，由敏感度分析，坡面流速愈大，集流時間愈短，CN值愈大，洪峰流量與暴雨流出量愈大。

關鍵字

暴雨逕流歷線 ； 頻率 ； 暴雨 ； 集水區 ； 畢祿溪

並列摘要

This study was to estimate stormflow hydrographs with triangular unit hydrograph method from 24-hour rainfall frequency data of Pi-lu-chi Experimental Watershed No. 11 by calculating rainfall excess with curve number method of Soil Conservation Service. The estimated peak flows, stormflow volumes and times of concentration from estimating stormflow hydrographs compare reasonably well with observed values. This model only requires input data of daily frequency rainfall, topography, hillslope runoff velosity and curve number. Therefore, this stormflow hydrograph estimation method appears to be rather useful in real world. The important parameters of this model were runoff veolcity on hillslope and curve number. Based on the sensitivity analysis, time of concentration decreased as runoff velocity on hillslope increased, peak flow and stormflow volume increased as curve number increased.

並列關鍵字

Stormflow hydrograph ； frequency ； storm ； watershed ； Pi-lu-chi