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利用IGDT方法選擇更適切的水資源經理調適方案

Using IGDT Method to Select Appropriate Plan for Water Resource Management

摘要


近年來的科學研究已經預告了未來氣候變化是巨幅振盪的趨勢,也預告了地球氣候的未來走向會有非常高度的不確定性,因此不僅科學資訊本身存在不確定性,社會科學將之實踐在治理時,也面臨很高的不確定性,這樣的現實則說明了永續發展的規劃,必然要在一個高度不確定的基礎上進行。本研究的動機即是思考面對氣候變遷不確定性這個無法規避的議題,要如何找出最適切的永續模式,來經營人類賴以為生的水資源。本研究以花蓮地區為案例,第一部分是假設其供水條件變差,再以系統動力模式模擬各供水系統的缺水係數(SI),檢視缺水風險的變化,結果顯示,原本SI 就偏高的池南供水系統,在降低供水量之後,SI 從5.681~8.923,升高到6.260~9.540,基於此一觀察,針對池南供水系統提出調適方案,並使用Information-Gap Decision Theory (IGDT)方式分析方案強健度。另外,第二部分分別使用AR4 及AR5 的情境條件,透過水文模式來模擬氣候變遷情境下研究區域的供水情況,再以系統動力模式計算每個供水系統的SI 值,檢視同樣系統動力模式模擬的SI 值,會不會因為AR4 及AR5 的情境條件而呈現不同的缺水風險,結果顯示,原本沒有缺水風險的豐濱供水系統及港口供水系統,在AR5 的模擬情境下,SI 分別出現3.22~5.31 以及8.82~11.22 的數值,這2 個供水系統缺水風險都升高了許多,值得進一步關注。至於原本就較為缺水的池南供水系統,AR4 模擬情境下的SI 為6.3~8.92,在AR5 的模擬情境下升高至22.08~24.01,不但具有缺水風險且已不容忽視。本文最後對不同的氣候變遷情境所造成的缺水,以及因應方案的選擇都做了一個比較。

關鍵字

缺水係數 不確定性

並列摘要


Recently published studies have forecasted a future climate pattern of high fluctuation. Also the future trend appears to have higher uncertainty than before. Therefore not only the scientific data themselves but also the data-based sustainable governance will undergo with a high uncertainty. Facing to such a challenge, this study is aiming at the development of better management plan for the water resource, one of our vital living elements. The first job of this study is by assuming a fixed ratio of shortage to use well-accepted system dynamic model to compute the deficiency index (SI) for each water supply system in Hualien area of eastern Taiwan. The IGDT method was then applied to further analyze the robustness and opportuness to find out better adaption plan. The second job of this study is to adopt the conditions of climate predictions from scenario AR4 and AR5 suggested by IPCC working group to go through above procedure. A final comparison for both of water deficiency and better management plan will be presented in this paper.

並列關鍵字

Water deficiency Uncertainty

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