以海岸防災與防護觀點而言，海灘必須有充裕的寬度，才能避免颱風暴潮巨浪對後灘公共設施的破壞及保護居民生命財產安全。這種由海灘灘線至後灘濱台受波浪掏刷所需的海灘寬度，稱為颱風侵襲時之「海岸緩衝帶寬度」。本研究在不考慮全球暖化及海水面上昇對已達到平衡剖面與濱台高度的影響下，應用SBEACH模組於美國CERC在1960年代的大型水槽試驗結果，檢討該模組中兩個最具代表性的參數值(K 與 ε )，應用於模擬直立式海堤前無海灘及堤前無充裕寬度情況，受颱風暴浪正向入射時的向離岸方向剖面變化；再模擬48個有充裕寬度的平衡海灘剖面案例，在颱風暴浪作用下，濱台後退幅度與潛洲位置與高度的特徵，以供海工界規劃海岸緩衝帶之參考。
SBEACH模擬結果顯示：(1)當海堤前無海灘或寬度不足時，無法抵禦颱風巨浪侵襲，導致堤趾被刷深或海灘完全消失；(2)若有充裕的寬度，不論是天然或人工養灘所造成，雖濱台在短時間內遭侵蝕後退，仍有餘地保護後灘的安全；(3)在相同的波高及週期條件下，沙灘中值粒徑愈小者，剖面坡度較緩，必須規劃寬廣的海灘，且在後灘濱台的設計高程為暴潮設計水位的1.6倍時，方能消減颱風巨浪的能量，達到海緩衝帶寬度的功效；由本研究所得之複迴歸式，輸入波浪條件及沙灘中值粒徑，可估算濱台刷深深度與侵蝕幅度及海岸緩衝帶寬度。

On the basis of coastal disaster mitigation and protection, a beach must have sufficient width for preventing the destruction to public facilities, as well as protecting the safety of life and private property during storm events. The requirement of such a horizontal extent from the initial shoreline to the probable erosion landward to safeguard against the onslaught of a storm is referred to as ‘storm beach buffer width’. Upon neglecting the effects of global warming and sealevel rise on a beach and berm with profile in equilibrium, numerical calculations are conducted first to validate the range of the most important parameters (K 與 ε ) in the SBEACH model using the results of profile changes available from the CERC’s large wave tank (LWT) tests in 1960s. These results are then applied to assess the profile changes for a beach with a vertical seawall and the other without sufficient berm, subject to the normal incidence of storm waves over a specific duration. Finally, a total of 48 cases with sufficient beach width are then investigated, from which a multiple linear regression model is proposed to determine the extent of berm retreat, as well as the location and height of a submerged offshore bar, for the benefit of coastal profession on preliminary design of storm buffer.
Our modeling results using SBEACH reveal that: (1) A seawall without or with insufficient fronting beach could result in serious scour at its toe and even the total loss of the entire beach berm; (2) A beach with sufficient berm, natural or artificially nourished, is capable of protecting the back beach, despite the temporary erosion in the early hours of a storm action; (3) Under the same conditions of wave height and period, a wide buffer is necessary for a beach with small mean sand grain, and the berm height should be designed at 1.6 times of the designed storm surge level, in order to effectively absorb storm wave energy and maintain the provision of a storm buffer; and (4) The multiple linear regression model proposed in this study can be used to evaluate the scour depth and retreat of the berm, as well as the width of a storm beach buffer, upon the input of wave conditions and mean beach sand grain etc.

第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 4
1.2.1 海灘剖面變化 4
1.2.2 海岸緩衝區 9
1.3 研究方法 11
1.4 本文組織 13
第二章 颱風暴潮巨浪作用的海灘過程 15
2.1 颱風特性 15
2.2 海灘剖面特性 16
第三章 海岸緩衝帶定義 25
第四章 SBEACH模組 32
4.1 模式介紹 32
4.1.1 波浪計算模組 33
4.1.2 淨輸沙率計算模組 39
4.1.3 海灘剖面變化計算模組 41
4.2 模式參數率定 45
第五章 波浪對海灘剖面變化的影響 51
5.1 重現期颱風波浪估計 51
5.2 不同重現期颱風波浪作用 55
第六章 海灘剖面變化模擬 67
6.1 直立式海堤前無海灘 67
6.2 海堤前無充裕海灘 75
6.3 海堤前配合人工養灘 83
6.4 綜合討論 91
第七章 海岸緩衝帶寬度估算 95
第八章 結論與建議 103
8.1 結論 103
8.2 建議 105
參考文獻 106

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