摘要:
以北戴河海滩养护工程作为实例,通过养滩前后3年的监测剖面数据,不仅计算了干滩宽度、中潮滩宽度、低潮滩宽度与单宽蚀淤量4个主要参数变量,分析了海滩剖面形态的演化特征,而且还计算了养护海滩效率系数和保存系数,结果显示:近3年来北戴河养护海滩干滩、中潮滩、低潮滩效率系数分别为5.37、2.88、1.47,保存系数分别为1.01、0.67、0.75。初步总结了北戴河养护海滩的短期功效,其中西海滩养滩寿命为10~12 a,延长养滩工程寿命包括养滩砂岸的长度,平面护岸体系,抛沙方量和破波高度等因素。
Abstract:
Taking the beach nourishment project of Beidaihe as a case, the width of the dries and medium and low tidal flats and the unit deposition-erosion rate were calculated with the profile monitoring data of three years before and after the nourishment, and the evolution of beach profile shapes analyzed. Efficiency coefficient and preservation coefficient of beach nourishment were calculated. The efficiency coefficient of the dries, medium and low tidal flats of beach nourishment in Beidaihe were 5.37, 2.88 and 1.47, and the preservation coefficient were 1.01, 0.67, 0.75 respectively in the past 3 years. In this paper, we summarized the preliminary effects of beach nourishment in Beidaihe, and discussed controlling factors. The lifetime of the nourishment in Western Beach is about 10-12 years, the factors which influence the nourishment life include the length of nourishment beach, spatial bank protection system, volume of sand replacement and height of breaking wave.
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