集水區尺度對洪峰流量之影響

Effects of Watershed Scale on Flood Discharge

林良宗(Liang- Zong Lin)

指導教授 ： 葉一隆

國立屏東科技大學/工學院/土木工程系所/碩士(2008年)

https://doi.org/10.6346/NPUST.2008.00232

摘要

本研究以降雨逕流模式HEC-HMS將東港溪流域流域劃分為16個子集水區，以進行多集水區降雨逕流模擬。依據徐昇氏法分配各雨量站雨量資料至各子集水區，利用HEC-HMS模式之Snyder’s單位歷線法將其轉換成逕流歷線。將子集水區之逕流量歷線與有效延時降雨歷線對潮州流量歷線作迴歸分析，探討各子集水區對下游洪峰流量之關聯性，進而分析子集水區地文尺度對洪峰流量的影響。利用面積-流量法與線性迴歸的分析結果均顯示，0612豪雨、碧利斯颱風、利奇馬颱風、杜鵑颱風在19號斷面(鄰近魚池溝排水)及38號斷面(界於芭樹埤排水與佳平溪排水間)都發生較大的變異量。在同一個集水區內，降雨型態直接影響不同劃分尺度之集水區逕流模擬值，以多峰之前段分布的降雨型態影響最明顯，單峰之後段分布的降雨型態影響最小。

關鍵字

尺度分析 ； 面積-流量法 ； 降雨逕流模式

並列摘要

This research used rainfall-runoff model, HEC-HMS, to simulate multi-watershed rainfall runoff within Donggang River flow basin, which was divided into 16 sub-watersheds. The rainfall amount in each station was distributed to each sub watershed according ShueShen method. The Snyder’s unit hydrograph in HEC-HMS model was transferred to runoff hydrograph. The relationship between runoff hydrograph and effective duration rainfall hydrograph within each sub-watershed and discharge hydrograph in Chaojhou station were conducted regression analyses that was intended to investigate the correlations between peak flooding flow downstream and each sub-watershed and then to analyze the impact of geohydrology scale of sub watershed on peak discharge. The results obtained from both area-flow and linear regression methods showed that sections 19 (close to YeChu draining ditch) and 38 (between Pashu draining ditch and ChaiPen Creek) occurred bigger variation during 0612 torrential rains, BeLees typhoon, LeeChi typhoon, and DooJam typhoon. In identical watershed, raining pattern directly influenced runoff simulated values in each sub-watershed that the influence of antecede distribution of multi-peaks had most significantly impact and the back section of single peak distributed had smallest influence.

並列關鍵字

Watershed Scale ； Area-Discharge ； Rainfall-Runoff Model

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