低水時河川面臨生態、環境、空間利用及水資源利用等問題。欲瞭解流域低水時之水文過程及水工設施、水資源利用對河川低水流量之影響，勢必要建立一套完整的低水模擬模式以瞭解低水流量特性。
進行河川低水模擬時，依流域組成特性，將流域分割成河段集水區，以河段集水區作為低水模擬中自然水文過程及水資源利用之分析單元。以高斯-牛頓最小化法決定最佳水文參數。
以曾文溪流域為例，低水模擬效果良好，充分展現河道各控制點流量變化特性。低流量模擬結果顯示，下游分析河段集水區流出量佔曾文溪流域流量30.2%，其中快速流、慢速流及迴歸水比例為64：80：1。嘉南灌區迴歸水平均每旬為0.027MCM。

When it's low flow , streams come across problems such as ecology , environment , land usage and water resources utilization . To realize the effects in the basin caused by hydrologic cycle , hydraulic structures , water resources utilization toward low flow quantity during low flow period , a complete low flow simulation model has to be constructed .
When low flow simulation is proceeding , according to the features of basin construction , divide the basin into blocks of stream block watersheds . And take these stream block watersheds as analysis units of natural hydrologic cycle and water resources utilization in simulation . The optimum hydrologic parameters are determined by Gauss-Newton method .
Take Tsengwen river basin as an example , low flow simulation runs well . And the characteristics of changs of flow rate at all control points are perfectly showed along the stream channel . This simulation reveals , the out-flow of downstream block watersheds is 30.2% of Tsengwen river basin's flow quantity . And amongst this , the proportion of fast flow , slow flow and return flow is 64:80:1 . The tendays average of return flow in Chianan irrigation areas is 0.027MCM .

中文摘要イ
英文摘要イ
致謝
目錄イ
表目錄イ
圖目錄イ
符號對照
第一章イ前言イ
1.1イ研究背景イ
1.2イ研究目的イ
1.3イ研究方式イ
第二章イ文獻回顧イ
2.1イ流域水平衡分析イ
第三章イ研究方法イ
3.1イ系統組成及分析程序イ
3.2イ集水區單元之水文過程イ
3.2.1イ水資源利用イ
3.2.2イ自然水文過程イ
3.2.3イ水平衡限制イ
3.3イ模式參數檢定イ
3.3.1イ模式檢定標準イ
3.3.2イ模式檢定及參數率定イ
第四章イ曾文溪低水模擬イ
4.1イ曾文溪流域概況イ
4.1.1イ流域概況イ
4.1.2イ水文、水工設施イ
4.1.3イ水資源利用イ
4.2イ曾文溪低水流量實例模擬イ
4.2.1イ模擬模式簡化假設イ
4.2.2イ高斯-牛頓法參數設定イ
4.2.3イ模擬資料イ
4.2.4イ曾文溪水系模擬切割イ
4.2.5イ快速流分析イ
4.2.6イ曾文溪低水流量檢定及驗證分析
第五章イ低水模擬探討イ
5.1イ低水流量模擬成果イ
5.2イ河道流量組成特性イ
5.3イ水資源利用之影響イ
5.3.1イ河川取水イ
5.3.2イ水庫、攔河堰、越域引水及迴歸水イ
5.4イ模式水文過程簡化假設之影響イ
第六章イ結論與建議イ
6.1イ結論イ
6.2イ建議イ
參考文獻イ

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