本文從海岸防災及防護角度擬定海岸緩衝區設立之原理。依據水動力、近岸流及潮流漂沙觀念，藉由學理分析，在近岸水動力、海岸漂沙及陸域海水可能到達地區，界定海域及陸域海岸緩衝區之範圍。本研究應用以嘉義好美寮海岸為對象，探討在五十年重現期的颱風波浪條件及平均最高潮位等因素的影響下，依據SBEACH 模式模擬海灘剖面變化情形，對不同剖面的海岸段進行動態模擬，分析相關海灘變化物理量之間的關係，並與溯升模式相結合，訂出海岸緩衝區水域及陸域之界線範圍，劃設範圍並與好美寮海岸現況資源及海岸環境影響因子相驗證，做最後海岸緩衝區綜合之研討。本文主要目的在建議海岸緩衝區劃設之定義、方法及流程，並擬定海岸緩衝區之管理指南，提供日後水利單位在劃設海岸緩衝區時之參考。

The purpose of this study is to establish basic principles for setting up coastal buffer zones. Following concepts of hydrodynamics, nearshore and tidal currents, and sand drifting, the coastal buffer zones on ocean and land interfacial areas can be defined. Numerical models for coastal waves, current, and topography are used to simulate coastal phenomena and determine parameters describing buffer zones. The proposed coastal buffer zone is applied to Haomeiliao coast in Chiayi. Using the SBEACH model together with conditions of 50-year recurrence period of Typhoon waves and average maximum tides, variations of coastal profiles are calculated. Dynamic simulations for various coastal profiles and analysis of physical quantities related to beach changes, together with calculations from run-up model, the coastal buffer zones on ocean and land interfacial area are then determined. The results are also referred to current coastal resources and environmental affecting parameters for overall discussions. The proposed definition, methodology, and procedure for coastal buffer zone can be practical for related hydraulic institutions in applying the concept in the future.

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