北海银滩泥化与硬化成因初探-海洋预报

北海银滩泥化与硬化成因初探

单位：1. 国家海洋局北海海洋环境监测中心站, 广西北海 536000;
2. 国家海洋环境预报中心, 北京 100081;
3. 国家海洋局海洋灾害预报技术研究重点实验室, 北京 100081

分类号：TV148

出版年·卷·期（页码）：2017··第六期（83-88）

摘要：

基于现场调查资料、近岸水动力条件和粘性泥沙基本理论，力图解决广西北海银滩泥化与硬化问题。主要结论如下：（1）银滩海域潮间沙滩岸边和高潮带泥沙特征为浅黄色细砂，水下岸坡沉积物为砂质覆盖，向海则变为泥质沉积，银滩泥化滩面泥沙中含有较高的“腐泥”成分；（2）银滩附近几个主要排污口的污水能够进入银滩海域，悬浮物浓度高值出现在江河或排污口入海口附近；（3）从泥沙输运的直接来源和污水排放导致的间接来源分析沙滩的泥质来源，人类活动的过度频繁造成了大量污水排入银滩海域，势必携带大量的污泥进入该海域；（4）入海泥沙在排放口附近海域落淤，污水中的“腐泥”成分在一定海洋动力条件下，在经历长期的累积固结过程，使沙滩发生泥化与硬化现象；（5）提出了适当的防治对策和建议，开展银滩整治工作。

Based on the field investigation data, near-shore hydrodynamic condition and basic principles of cohesive sediment, the muddy and consolidating problems were tried to be resolved in this paper. Several conclusions were presented.(1) The character of sediment at near-shore and near high-tide-level coast is light yellow fine sand. Submarine slope of coast is covered by sand while the sea-ward becomes muddy deposition. There is a great number of decayed mud in sand front around Silver Beach.(2) The sewage from several main waste exits can enter into the areas. The high value of suspended particles appears near estuary and sewage exits. (3) Direct source of sediment transport and indirect source from sewage were analyzed to propose the source of clay. Anthropogenic processes cause plenty of sewage discharge into the coastal areas, which carries amount of decayed mud into the areas.(4)The cohesive sediment deposits near the sewage exit, then decayed mud gradually experiences a long process of accumulation and consolidation under certain oceanic dynamic conditions, which causes sand beach become muddy and consolidating.(5)Several proper suggestions are proposed in order to develop the regulation and improvement.

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