雨水文線(Storm Hydrograph)是集水區之地文與氣象大因素在颱洪時期所呈現出的時序曲線，以往的水文模擬常以概型模式進集水區出口線的演算。近，隨著空間資訊技術的發展和值計算方法的進步，集水區的雨逕研究已逐漸由集塊概型(Lumped Conceptual)的水文演算(Hydrologic Routing)取向，朝向分佈物型(Distributed Physical)的水演算(Hydraulic Routing)取向。本計畫主要研究目的擬以三期程，針對基河南湖大橋上游集水區為應用，運用申請人研發的顯隱混合有限體積算則(Implicit-Explicit Hybrid Finite Volume Schemes)進簡化型聖凡南方程式 (Simplified Saint-Venant Equations)之值求解，並整合空間資訊學(地資訊系統、值高程模型、遙測影像分)的處技術以析取集水區相關的物特徵與作用，構建一個新的分佈物型水文模式，期能針對單場事件之集水區雨逕的時空分佈進確的模擬預測。
The storm hydrograph is a temporal graph showing the integral expression of the physiographic and climatic characteristics of a watershed during storm rainfall. The conceptual models were used to compute the discharge hydrograph at the watershed outlet in past. Due to the development of spatial information techniques and the progress of numerical schemes, the study trend of watershed rainfall-runoff models are gradually transferred from a lumped conceptual hydrologic routing approach to a distributed physical hydraulic routing approach in recent years. The objective of this 3-year study is to develop a new distributed physical hydrologic model to improve the spatial and temporal rainfall-runoff simulation for given storm events happened in the Na-Hu Bridge watershed of the Chi-Lung River. The proposed model adopts the implicit-explicit hybrid finite volume schemes to discretize the simplified Saint-Venant equations and the spatial information techniques (such as: geographic information system, digital elevation model, and remotely sensed imagery classification) to derive the physical characteristics and parameters of watershed.
