溪流複合式指標評估模式之建構

An Approach to Stream Integrity Assessment Model

溪流整治是水利工程重要一環，但施作時往往對環境產生某程度的破壞或影響，由於過去整治計畫推動上或實際施工時仍缺乏一套完整的生態評估或溪河健康狀態評估或環境影響評估，其可適用於各種評估機制層面的綜合模式，包含考慮到生物、水質及棲地環境面向的評估指數或模式。因此，本研究試圖整合國內外常用的相關棲地環境、生態、生物指數與模式，研訂一套簡要的整合型矩陣模式準則，藉此建立複合式指標評估模組，俾以應用於整治工程對溪流環境生態之影響或整治後整體的生態評估或健康狀態評估。本研究並以台北縣雙溪鄉后番子坑溪應用生態工法整治進行影響評估及石門水庫上游集水區生態健康狀態評估為例，進一步探討其評估應用情形。 This study was intended to build a stream integrity assessment model (SIAM) by integratingsome of the commonly known ecological indices for assessing the ecological status before and after thestream restoration and engineering projects. The three commonly used ecological indices were biologicalintegrity index (IBI), river pollution index (RPI) and quality habitat evaluation index (QHEI). The SIAMwas expressed in the form of linear weighting equation as SIAM= W1×IBI+W2×RPI+W3×QHEI.Two case studies were conducted to evaluate the feasibility of the model for assessing the streamrestoration engineering project at the Hofanchuken Creek, Taipei County and the health status of thetributaries to the Shihmen Reservoir.