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標題: 二仁溪集水區降雨-逕流歷線模式建置之研究
Establishment of Hydrograph Simulation Model for Erhjin River Watershed
作者: 劉志宇
Liu, Chih-Yu
關鍵字: 降雨-逕流模式;Rainfall-runoff model;常態化差異性植生指標;地理資訊系統;逕流係數動態模式;合理化公式-流量歷線修正式;Normalized Difference Vegetation Index;Geographic Information Systems;Runoff coefficient dynamic model;Modified rational algorithm for predicting hydrograph
出版社: 水土保持學系
Erhjin river watershed is located in Southern Taiwan. Frequent flood events occurred each year during the period from June to August cause heavy casualties and serious property losses.
Normalized Difference Vegetation Index derived from SPOT image coupled with Geographic Information Systems was used in this study to establish the rainfall-runoff model for runoff hydrograph simulation at the given point of channel.
The correction coefficient (,) and the revised recession curve (R) calibrated from the observed data can be as the index of watershed characteristics. The correction coefficient α represents water conservation capability; the β-value can be employed as the index of sediment concentration in runoff. The model improved the limitation of rational formula in large watershed and used distributed concept for runoff coefficient calculation in runoff hydrograph simulation. The results show a highly correspondence for single and double peak event and poor agreements for multi-peak hyetograph patterns.
To examine the variation of correction coefficient in different watershed, the Erhjin river basin shows minimum variance of  and  because of low infiltration rate in the watershed. About thirty creeks with highly potential debris flow in Chen-yu-lan basin results in a maximum variance of  at Ne-mao-pu station, while the maximum variance of  appears at the Jieshou bridge station due to the antecedent precipitation.

本研究以常態化差異植生指標(Normalized Difference Vegetation Index;NDVI)結合地理資訊系統(Geographic Information System;GIS),考慮空間及時間分布因素,建立二仁溪流域之逕流係數變動模式,再利用網格式之降雨強度資料及配合集流時間之集水區面積參數,以等集流時間之概念,修正合理化公式之限制,提出合理化公式-流量歷線修正式。透過監測站實測流量資料,推求合理化公式-流量歷線修正式之(洪峰到達時間修正係數)、(洪峰值修正係數)校正係數及退水修正式R,建置二仁溪流域降雨-逕流模式。研究結果顯示模式模擬單峰暴雨時極佳,其效率係數可達0.96;雙峰暴雨之模擬效率稍低,但其效率係數亦達0.85以上;對於多峰或離散型降雨之模擬較不佳。
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