本研究旨在發展河口地形變遷模式並結合地文性土壤沖淤模式，分析豪雨暴潮期間潟湖與相鄰排水系統間之水理與泥沙淤積現象，以應用於沿海區域排水系統之淹水改善分析。由模式模擬結果得知，在有沙洲的保護下，沿海地區可免受海浪暴潮直接衝擊，加上潟湖具滯洪的作用，潟湖內波浪穩定；在無沙洲保護下，上游渲洩之洪水與外海暴潮直接影響河口與沿海地區排水，水位潮差大。潟湖內水位比較，在有沙洲保護下潟湖內水位較高於無沙洲保護下之水位，由此可知沙洲的存在有抬高水位，蓄儲水流之功用，卻阻礙上游河流流量之渲洩。

The models for outfall landform transition and the physiographic soil erosion-deposition were used in this study to analyze the phenomena of hydraulic and soil depositions during the period of storm surge flood in the lagoon and drainages to decrease the inundated potential in the coastland. The results indicate that the storm surge did not directly breach the coastland due to the bars, the flood detentions and steady waves in the lagoons. However, the flood flow from upstream river and storm surge impact the drainage for outfall and coastland. The water stage in the lagoon that was protected by the bars was higher than that without the protection of the bars. Because of the bars existence, the water stage were risen and flow discharge were stored but the flood releasing from the upstream river was retarded.

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