近期辽东湾西侧砂质海滩冲淤特征
发布时间：2018-12-14 14:21
【摘要】：2013—2014年,在辽东湾六股河口两侧开展了海滩地形及海岸侵蚀的现场调查,于兴城至绥中沿海布设6处调查岸段及17条断面。结果表明,研究海滩地貌主要组成部分包括反射型高潮滩-滩坎-消散型低潮滩,其中低潮滩多发育有近岸沙坝和水下沙坝。绥中南江屯、皮家屯及兴城新立屯海滩侵蚀明显,多数海滩持续侵蚀,调查期内最大平均下蚀速率达53.2cm/a。分析发现,海滩地形及断面蚀淤量有较明显的季节或区域差异。海滩冬季近岸沙坝消失、水下沙坝离岸距离小于夏季。六股河口南侧夏季海滩断面侵蚀量增加、淤积量减少,而六股河口北侧相反。研究认为,岸线自然形态差异及其造成的沿岸输沙差异是导致不同岸段蚀淤差异的主要自然原因。海岸封闭性建筑物(尤其是突堤)影响了海滩局部断面蚀淤变化。海滩地貌及蚀淤的季节或区域变化的主要原因为沿岸波浪特征等因素的季节性和区域性差异。
[Abstract]:In 2013-2014, the beach topography and coastal erosion were investigated on both sides of Liugu estuary in Liaodong Bay, and 6 investigation sections and 17 sections were set up in Xingcheng to Suizhong coastal areas. The results show that the main components of the study beach landform include the reflective high tide beach-bank-dissipated low tide beach, in which there are mostly nearshore sand dams and underwater sandbars. In Suizhong Nanjiangtun, Pijiatun and Xinlitun of Xingcheng, the beach erosion is obvious, and most of the beaches continue to erode. The maximum average erosion rate during the investigation period is 53.2 cm / a. It is found that there are obvious seasonal or regional differences in beach topography and cross-section erosion and deposition. Beach inshore sand dams disappear in winter, and the offshore distance of underwater sand dams is smaller than that in summer. On the south side of Liugu estuary, the erosion amount of beach section increases and the amount of deposition decreases, but the north side of Liugu estuary is opposite. It is considered that the main natural reason for the difference of erosion and siltation in different coastal sections is the difference of natural morphology of shoreline and the difference of coastal sediment transport caused by it. The coastal closed buildings (especially the breakwater) affect the erosion and siltation of the local section of the beach. The seasonal or regional variations of beach landforms and erosion and siltation are mainly due to seasonal and regional differences in coastal wave characteristics.
【作者单位】： 国家海洋环境监测中心;河北省科学院地理科学研究所;
【基金】：国家海洋局预报减灾司全国海岸侵蚀监测评价与预警辽东湾试点项目 国家海洋公益性科研专项“海岛旅游海滩管理技术研究与应用示范”(201405037) 河北省科学院科技计划项目“河北省海域承载力及典型海洋灾害预警”;“河北省环首都山区水土流失与地质灾害防控研究”
【分类号】：P737.1
，
本文编号：2378751
[Abstract]:In 2013-2014, the beach topography and coastal erosion were investigated on both sides of Liugu estuary in Liaodong Bay, and 6 investigation sections and 17 sections were set up in Xingcheng to Suizhong coastal areas. The results show that the main components of the study beach landform include the reflective high tide beach-bank-dissipated low tide beach, in which there are mostly nearshore sand dams and underwater sandbars. In Suizhong Nanjiangtun, Pijiatun and Xinlitun of Xingcheng, the beach erosion is obvious, and most of the beaches continue to erode. The maximum average erosion rate during the investigation period is 53.2 cm / a. It is found that there are obvious seasonal or regional differences in beach topography and cross-section erosion and deposition. Beach inshore sand dams disappear in winter, and the offshore distance of underwater sand dams is smaller than that in summer. On the south side of Liugu estuary, the erosion amount of beach section increases and the amount of deposition decreases, but the north side of Liugu estuary is opposite. It is considered that the main natural reason for the difference of erosion and siltation in different coastal sections is the difference of natural morphology of shoreline and the difference of coastal sediment transport caused by it. The coastal closed buildings (especially the breakwater) affect the erosion and siltation of the local section of the beach. The seasonal or regional variations of beach landforms and erosion and siltation are mainly due to seasonal and regional differences in coastal wave characteristics.
【作者单位】： 国家海洋环境监测中心;河北省科学院地理科学研究所;
【基金】：国家海洋局预报减灾司全国海岸侵蚀监测评价与预警辽东湾试点项目 国家海洋公益性科研专项“海岛旅游海滩管理技术研究与应用示范”(201405037) 河北省科学院科技计划项目“河北省海域承载力及典型海洋灾害预警”;“河北省环首都山区水土流失与地质灾害防控研究”
【分类号】：P737.1
，
本文编号：2378751
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