在河、海交會效應對於河川排水的影響，常見的水文模式在計算時，多假設河海之外水不得溢淹至內水，將河海效應分別計算，無法真實反應出沿海低窪地區颱風暴雨期間，河口受海域暴潮頂托致河水暴漲無法排出的水動力現象。因此，應用耦合內外水水文模式計算暴潮位，模擬河川水動力現象確有其需求。
近年來氣候異常，極端降雨頻繁，常造成大範圍之沿海低窪地區飽受威脅；尤其對河川老舊堤防之安全與河川治理觀念上，已不是僅由堤防結構上著手，或單從河川治理來處理，而必須考慮河系調適與河口海域外水的交互影響，即須有河海共治之觀念；本研究採用「耦合河海水文模式」數值模擬法來探討，本耦合模式法具有模擬高強度、長延時、大範圍的極端降雨型態之特性，因此本研究首次引用2009年8月8日風災的林邊溪潰堤為模擬對象，利用林邊溪河口海域風場資料，結合海洋波浪模式（WWM）及暴潮模式（POM模式）的模擬分析，進行演算河口的最大暴潮水位，作為河道WASH123D模式執行林邊溪模擬潰堤、溢淹之結果時的下游邊界條件。
以WASH123D模式模擬林邊溪河堤潰決結果，經探討得知其破壞機制（1）鐵路橋北側林邊堤防破堤及佳冬堤防潰堤確有河口暴潮位抑阻河川流量排入海面之情況，致河口水位抬升擁高，河川產生回水現象；當河口暴潮位退潮時，河川水位開始降低，此水動力衝擊作用形成堤內（堤心）滲流沖湧及河床坡趾淘刷之現象，造成邊坡結構塌陷致基礎滑動破壞堤防；（2）竹仔腳堤防潰堤係因新埤排水土堤先潰決，河水滿溢出來後，發現不斷掏空堤防臨陸面側之基腳，且潰堤處正好位於林邊溪轉彎的凹岸，本次降雨不但洪流量大而延時也長，故在水流侵襲、沖刷和彎道環流的作用下，加上臨陸面堤防基礎逐漸被淘刷使岸坡變陡，上層土體結構失穩致使竹仔腳堤防塌陷。

Regarding the effects of rivers and seas to river drainage, the flood modeling usually assumes that the water of the rivers and seas does not invade to the internal water, or calculate the river/sea effect separately. However, the assumption is against the truth, and therefore cannot reflect the hydrodynamic phenomena of the coastal low-lying areas when experiencing drainage difficulty resulted from water surging at the sea estuary during the typhoons or storms. Consequently, it is necessary to simulate the river hydrodynamic with storm surge level derived from external and internal water coupling.
In recently years, the severe Climate Change has caused extreme rainfall and frequent floods that seriously threaten coastal low-lying areas. It is not enough for old riverbank safety protection and river management to only focusing on embankment structure or river management itself. It is necessary to consider the interaction of river adjustment and external water from the seas through river estuary. In other words, the concept of “co-management of rivers and seas” needs to be applied. This study adopted numerical simulation based on “river and sea hydrology coupling model”, which was capable to simulate the hydrodynamic of the whole area of the rivers and seas under high intensity, long-lasting, and large range rainfall. The broken overflow conditions in Linbian Village of Kaohsiung in Taiwan during the typhoon disaster on 8th Aug. 2009 were taken as the simulation object. The wind field data of Linbian Creek estuary was integrated with typhoon wave model (WWMⅡ) and surge model (POM) for the simulation analysis and calculation of the maximum surge level of the river estuary. The results were used as the downstream boundary conditions when implementing simulation of broken overflow and flooding of Linbian Creek through waterway WASH123D model.
The results of WASH123D model simulating the burst embankment of Linbina Creek indicated the damage mechanism as follows：
1. The surge at estuary indeed prevented the river water from flowing into the sea. In consequence, the water level of the river was raised and caused backwater. When the surge ebbed away, the hydrodynamic impact caused by the descending water level resulted in seepage within the embankment (core) and toe scour. Therefore, the slope structure collapsed to cause the groundwork sliding and gradually led to Linbian Creek embankment breaking in the north of the Railway Bridge and burst embankment at Jiadong.
2. The Jhuzihjiou Embankment burst resulted from the burst of Sinpi Drainage earthbank. The overflowing water kept scouring the bank foot on the side of the land, where was also the concave bank of Linbian Creek. Besides, the rainfall lasted for a very long time and caused great amount of flood water. The invading of the water flow, circulation at the river curves, and the scoured land-side embankment groundwork steepened the bank, unsettled the upper structure, and finally collapsed the Juzihjiou Embankment.

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