射阳港区双导堤建设前后冲淤变化及成因研究

发布时间：2018-01-15 04:10

本文关键词：射阳港区双导堤建设前后冲淤变化及成因研究　出处：《海洋通报》2017年05期 　论文类型：期刊论文

【摘要】：基于近年来射阳港区水下地形数据和定点全潮水文观测资料,分析了双导堤建设前后冲淤变化特征,并对其成因进行了初步探讨。研究结果表明,研究区近6年来总体上以淤积为主,净淤积量约为65.23×106m3,年均净淤积速率约为7.9 cm/a;淤积区域主要分布于导堤两侧浅水区,侵蚀区域主要分布于导堤口附近。2008-2013年间研究区冲刷、淤积和相对稳定区域面积分别占15%、55%和30%。堤口东侧的SSW02站实测最大流速为1.54 m/s,北堤北部的SSW01站为1.4 m/s,无论是涨潮还是落潮,堤口均大于导堤北侧;导堤产生了沿堤水流和口门回流,改变了导堤两侧附近海域潮流方向并增大了口门处的沉积动力。研究区泥沙运动方式主要表现为波浪掀沙、潮流输沙;区域海流泥沙的沿程落淤和导堤挡流效应导致导堤两侧出现淤积,导堤产生的回流促使堤口冲刷和堤内泥沙回淤。导堤引起的局部流场变化是海底冲淤格局重新分布的主因。
[Abstract]:Based on the underwater topographic data of Sheyang port area in recent years and the observation data of the whole tidal water at fixed point, the characteristics of scour and siltation before and after the construction of double guide dikes are analyzed, and the causes of their formation are preliminarily discussed. The results show that. In the last 6 years, the main deposition in the study area is siltation, the net deposition amount is about 65.23 脳 106m3, and the average annual net deposition rate is about 7.9 cm / a; The silting area is mainly distributed in the shallow water area on both sides of the guide embankment, and the erosion area is mainly distributed in the study area near the entrance of the guide embankment. The area of siltation and relatively stable area accounts for 15% respectively from 2008 to 2013. The maximum measured velocity of SSW02 station on the east side of the embankment is 1.54 m / s, and that of SSW01 station in the north part of the embankment is 1.4 m / s, both high tide and low tide. The dike mouth is larger than the north side of the guide embankment. The flow along the embankment and the reflux of the entrance change the direction of the tidal current near the two sides of the guide embankment and increase the sedimentary power at the entrance. The sediment movement mode in the study area is mainly characterized by wave sediment lifting and tidal current sediment transport. The silting along the course of the regional current and the blocking effect of the diversion dike lead to the deposition on both sides of the guiding embankment. The backflow caused by the guide embankment causes the erosion at the entrance of the embankment and the silt in the embankment, and the change of local flow field caused by the guide embankment is the main reason for the redistribution of the undersea scour and siltation pattern.
【作者单位】：江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院;
【基金】：中国地质调查局海洋地质保障工程专项-长江三角洲海岸带综合地质调查与监测(江苏潮间带)(GZH201200506) 江苏沿海地区综合地质调查专项-江苏盐城地区海岸带地质环境调查与评价
【分类号】：U652.3
【正文快照】： 射阳港位于江苏省盐城市射阳县境内的射阳河入海口处,为盐城市重点发展的“一港四区”之一。射阳河口处于苏北废黄河三角洲侵蚀性海岸与辐射沙洲内缘区淤长型海岸的过渡岸段,被认为是苏北侵蚀岸段与淤积岸段的分界点(任美锷,1986;陈宏友,1991;刘燕春等,2010;王志一等,2013)。

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