第五章 結論與建議
5.2 建議
由於蜿蜒複式河槽所牽連之相關因素極為複雜，因此本研究不盡完備 處或可再深入探討之方向，將陳列如下以供日後參考：
1. CCHE2D 模式之二次流機制僅由平均河寬此單一值來推估，應用在 有寬窄變化、曲率半徑不同的現地河川時可能過於簡略，為模式較 不足之處。
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2. 在設定岸壁沖刷模組中的岸壁臨界剪應力值為重要參數之一，其原 始理論是由土壤特性的鈉吸附比、孔隙流體鹽類濃度和電界質擴散 來決定，但這些參數取得不易，是否有更簡便的方式可以決定岸壁 臨界剪應力值可再研究。
3. 本研究之實驗室案例皆為定量流且單一粒徑的河床質組成，之後可 增加其他如變量流、不同級配組成之河床質、變動的底床坡度、有 寬窄變化的洪水平原及主深槽等等變因，更加深入了解彼此的關 聯。
4. 蜿蜒複式河槽之主深槽和洪水平原交界處流場變化劇烈，渠道剖面 不為方正矩形，糙度係數的推估比一般情況較為複雜，在數值模擬 上如何設定糙度係數，將實驗成果應用在數值模擬，讓數值模擬能 更符合實際情形仍是有待研究。
5. 複式河槽因垂直方向有地形變化，水理特性會隨水深不同而變化，
此種特性可用有考慮垂直方向變化的三維數值模式進行模擬。而應 用在現場案例時，若是能更精確的掌握深槽地形資料及高灘地的地 質、土地利用、植生狀況等，將會增強模擬的實用性。
6. 本研究為二維水深平均模式應用於蜿蜒複式河槽的模擬結果。對於 颱洪期間洪水漫淹至洪水平原後，水流挾帶的泥砂量、水流對於主 深槽及兩岸高灘地的影響等均須加強現場觀測資料，可提供數值模 擬改進的方向。
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