波流共同作用下促淤效果计算模式 - 水利水运工程学报.DOC

连云港海域悬沙和表层沉积物交换 刘 红1,2(，顾 勇1，马兴华1，金鏐2 （1、中交上海航道勘察设计研究院有限公司，上海，200124； 2. 华东师范大学河口海岸学国家重点实验室，上海，200062） 摘要：采用粒度谱计算方法分析连云港海域悬沙和表层沉积物交换，为徐圩防波堤口门布置和连云港港航道回淤研究提供理论依据。连云港主航道和徐圩航道5m等深线以外的区域悬沙和表层沉积物交换率，航道回淤强度将处于较小的水平，对航道维护是有利的；5m等深线以内的区域交换率在0.3~0.4之间，悬沙落淤对航道回淤有一定贡献，该段航道回淤量，与实航道回淤强度分布基本一致，为航道回淤研究和航道维护提供了科学依据。灌河口沙嘴交换率在0.2以下5m等深线以内的破波带水域交换率大于0.5，悬沙悬沙和表层沉积物交换较为频繁的粒度组分主要集中在62μm的细颗粒组分，62μm粗颗粒组分交换相对较少。为减少泥沙回淤对徐圩港区港池正常运行的影响，建设防浪挡沙堤并将堤头布置在破波带之外是十分必要的。 关键词：连云港；悬浮泥沙；表层沉积物；粒度谱计算；泥沙交换 Suspended Surface Sediments Exchange at Lianyungang and Adjacent Areas LIU Hong1,2, GU Yong1, MA Xing-hua1, JIN Liu2 (1. Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China； 2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University，Shanghai 200062, China) Abstract：The suspended surface sediments exchange at Lianyungang and adjacent areas were analyzed based on the grain size spectral calculation, to provide theoretical basis for general layout of breakwater entrance at Xuwei Port and siltation research on channels at Lianyungang port. The sediment exchange ratio at the main Lianyungang Channels and Xuwei Channels outside the 5m isobaths was between 0.1 and 0.2, indicated the siltation intensity was relative low and it was beneficial to the channel maintenance. The exchange ratio at the channel inside the 5m isobaths was between 0.3 and 0.4, indicated the suspended sediment deposition was contribution to the channel siltation. The characteristic of sediment exchange ratio distribution was coincident with that of channel silting intensity. This result provided the scientific basis for the research on the channel siltation and channel maintenance. The sediment exchange ratio at sandspit of Guanhe Estuary was below 0.2 under normal climate condition. The sediment exchange ratio on surf zone which inside the 5m isobaths area was 0.5 which indicated that the suspended surface sediments exchange was occurred frequently. The grain size components o