據巴西南部海灘研究顯示，海灘意外的成因中有78%是來自裂流帶來的危害，台灣四面環海，海灘眾多，不僅風景優美，亦適合從事海灘休憩和水域活動。鑑於國內海灘意外事件頻傳，裂流既為海灘危險的最主要因子，管理當局實有必要針對「裂流與海灘安全」的議題加以探討。然而過去國外文獻探討裂流發生的機制，主要探討的是海灘營力對於水下沙洲的影響，福隆海域東南端有雙溪河口注入，當探討海灘水下沙洲的變動時，也需考慮到河口逕流營力的影響。本研究即以Wright and Short（1984）的海灘模式為依據，探討不同時距下福隆海域海灘類型和裂流分布的時空間變動、以及波高營力和逕流營力等因子的影響，並應用於評估福隆海域之海灘安全性。
就海灘類型變動而論。北部鹽寮海灘段的海灘類型和當日平均示性波高的相關係數可達0.90以上，反映出海灘形態在波高影響下的立即反應，突發事件期間，海灘則呈現極端消散的狀態；東南部河口附近海灘則深受河口逕流流路切穿的影響，無法利用Wright and Short（1984）的理論進行分類，乃以河口逕流出海的角度最為型態判斷的依據。結果發現波浪營力增大時，河口逕流會往河口左側沿岸偏移。
就裂流分布變動而論。若比較冬、夏季的裂流分布，冬季的裂流數遠較夏季為多，且其位置的偏移量也較夏季為大，此反映出冬季波浪營力變化較大，夏季波浪營力趨於穩靜的事實；若比較各海灘段裂流位置偏移的空間差異，東南部河口沙灘附近之裂流擺移量遠較北部的鹽寮沙灘為大，單日移動量最高可達到75m以上，且相較於西北部裂流往東南偏移為主的情形，其皆是往西北偏移的現象，推測是由於波浪和逕流共同作用的結果。
就海灘安全性評估而論。海灘夏季較適合開放，然而於突發事件期間，海灘危險等級極高，應避免從事海灘遊憩活動；然而不論冬季和夏季，東南端堤防旁之裂流和河口逕流固定存在，需避免到海域東南側戲水。
比較Short等人於澳洲之研究，其海灘類型於冬、夏季具有常態性的規律變化，從短期變化來看，其各季節內的差異並不大，即使有短暫大浪，也只是讓裂流暫時消失。然而就台灣而言，長期四季雖仍具有常態性的變化，各季節內之變動量卻明顯有別：夏季季內變動不大；冬季隨著東北季風波浪營力的興衰，其變動較為明顯。尤其是台灣短期的突發事件，其極端的大浪會讓海灘呈現極端消散之狀態，使得原有的裂流形態和位置重組，此對裂流位置預測與海灘安全區之劃分來說是必須關注的課題。

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