台灣近年來不當的海岸開發利用等人為因素和自然因素影響海岸地區地形和生態上的動態平衡，甚至於造成災害和衍生不可逆的改變，海岸災害包括海岸侵蝕、造成海水污染、海岸環境降級和生態棲息地消失等。海岸緩衝區(coastal buffer zone)能透過降低侵蝕、減輕海岸災害、改善水質、擴展棲息地和降低海岸降級對不當的海岸使用和極端事件已有非常大的影響。本文從海岸水動力學觀點界定海岸緩衝區定海岸水動力和漂沙運移之影響範圍，讓波潮流有比較足夠的空間消能或搬運砂石，尊重大自然並設法使漂沙收支平衡而創造優良的海岸環境，建議海岸適當開發利用或過度海岸防護而向外延伸。海岸緩衝區對於海岸災害亦具有緩和、減輕與預防之功能，成為防災與保護之緩衝地帶。
本文以近岸水動力和海岸漂沙之數值模擬和學理分析依據提出海岸緩衝區的建立。文中首先參考河川緩衝區的劃設準則，並嘗試以河川緩衝區之劃設方法應用到有關海岸地區的緩衝之界定。本文以嘉義好美寮海岸為研究示範，由學理分析和數值計算結果劃設海岸緩衝區範圍。根據50年重現期的颱風波浪條件並考量平均最高潮位等因素影響下，推算由FLOW-3D及經驗公式推估波浪溯升範圍，並利用SBEACH模式模擬海灘剖面變化情形及漂沙移動臨界水深，進而訂定出海岸緩衝區的海域界線。本文以好美寮海岸為例，利用數值模擬和學理分析劃設緩衝區。

A coastal buffer zone can have a tremendously positive impact on the unwise coastal utilizations and extreme events by reducing erosion, mitigating coastal disasters, improving water quality, expanding habitats, and reducing coastal degradation. We first review the literature on the riparian zone of buffers, and then acquire them to the demarcation of coastal zone. An appropriate range of coastal buffer zone is investigated using SBEACH model and FLOW-3D numerical model. The seaward boundary is estimated based on the SBEACH model with 50-year return period typhoon wave conditions. In the same way, the landward boundary of coastal buffer zone is predicted by FLOW-3D numerical model as well as wave run-up empirical formulas. Numerical results show that the cross-shore distribution of the maximum wave run-up height and the closure depth, estimated from SBEACH can successfully the range of coastal buffer zone. The FLOW-3D numerical model based on the Navier-Stokes equations was adopted for the simulation of wave propagating over the topography. Wave run-up height was calculated both by FLOW-3D and empirical formulas. Both results are compared and used to define the range of coastal buffer zone. Although many complex factors are involved in nearshore hydrodynamics and coastal processes, the combination of a proper buffer zone from SBEACH model, FLOW-3D and wave run-up empirical formulas for simulating beach profile changes and run-up heights for planning a coastal buffer zone has the potential to become a proper planning tool for coastal buffer zone. A typical example for the delimiting the coastal buffer zone is given in the Haomeiliao Coast. It has been shown that the present method is applicable to bound coastal buffer zone in practical applications.

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