基于B-L曲线的河-海划界研究

发布时间：2018-05-07 04:00

本文选题：河-海划界 + 地貌学指标　；参考：《海洋学研究》2017年03期

【摘要】：入海河口是河流向海洋过渡的区域,作为海岸带的一部分,具有独特性与复杂性,基于岸线形态的海岸地貌学指标与众多河口参数具有密切的联系与影响,而以地形节点作为河-海划界方案具备可行性与可操作性。在河流中心线上某点处,定义河流宽度(B)和沿河流中心线到口门处距离(L)的B=f(L)函数来实现河-海划界的定量划分,并对不同类型河口使用该函数曲线寻找地形节点进行河-海划界。结果表明:沙坝或堵塞型河口其地形节点处的河流展宽速率在-0.5~0之间;河道状河口及河网状三角洲其地形节点处的河流展宽速率在0.5~1.2之间;河口湾型河口的地形节点处的河流展宽速率在0.6~1.5之间;喇叭形三角洲河口其地形节点处的河流展宽速率在1.3~4.5之间;鸟足状三角洲和扇形三角洲的入海河口段的河流展宽速率在0~0.2之间,建议以口门处作为地形节点。应用此方法对我国大陆入海河流进行河-海划界,并进行中国大陆河口岸线长度量算,取得良好效果。
[Abstract]:As a part of coastal zone, estuaries are unique and complex. The coastal geomorphological indexes based on shoreline form are closely related to many estuary parameters. It is feasible and operable to use topographic nodes as river-sea delimitation scheme. At a point on the central line of a river, the functions of the width of the river B) and the distance from the central line of the river to the mouth L) are defined to realize the quantitative division of the boundary between the river and the sea. The function curve is used to search the topographic nodes for different estuaries to delimit the river-sea boundary. The results show that the river broadening rate at the topographic node of sand dam or clogged estuary is between -0.5 and 0, and that at the topographic node of river mouth and river network delta is between 0.5 and 1.2. The river broadening rate at the topographic nodes of estuarine estuaries is between 0.6 and 1.5, and that at the topographic nodes of loudspeaker delta estuaries is between 1.3 and 4.5. The river broadening rate of the estuarine section of bird foot delta and fan-shaped delta is between 0 and 0.2. It is suggested that the mouth should be used as the topographic node. The method is used to demarcate the rivers and seas in the mainland of China, and to calculate the length of the estuaries and shorelines in the Chinese mainland, and good results have been obtained.
【作者单位】：华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金项目资助(41376098,41476077)
【分类号】：P737.1

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