【摘要】 水下地形等深线是水深常用的表达方式,可以反映某一水下区域整体地形情况,传统的水下地形等深线的提取方法都是采用已有的软件进行手工操作,自动化程度较低。本文基于黄河口水下地形监测点数据,采用ArcGIS Engine二次开发组件和C#语言相结合的方法,实现了黄河口口门近海区域典型年份水深线的自动提取,在此基础上,对黄河口新口门附近水下地形的冲淤演变特征进行了研究,结果表明:黄河口清水沟流路自1996年改走清8汊河已10余年,黄河口新口门附近的海域由于入海泥沙的沉积扩散,海域地形发生了非常大的变化,黄河口新口门水下地形呈椭圆形分布,椭圆长轴不超过15km,短轴不超过10km,说明黄河入海泥沙的沉积分布,除了新口门的大量淤积和老口门的剧烈冲刷外,其余大部分区域的冲淤厚度都在1m以内。更多还原

【Abstract】 Contours are the primary expression of water depth,they reflect an overall regional underwater landform.The traditional extraction methods are based on existing software and short of automatic degree.Based on the data of the Yellow River Estuary,the methods of interpolating points and extracting contours are discussed.Through analyzing the contour extraction steps and the main idea of ArcGIS Engine,the automatic extraction of contours has been realized in the Yellow River Estuary.It is applied to the Yellow River Estuary geographic information system.Using the method of data analysis,the evolution characteristics of underwater delta near the new mouth of the Yellow River Estuary are studied.The Qingshuigou channel has shifted to the Qing8 branch for more than ten years.The results show that because of the depositing and spreading of the incoming sediment,the landforms of underwater delta near the new mouth has been changed greatly.The underwater delta appears as an oval.The major axis of the oval is about 15km long and the minor axis is about 10km long.It illustrates that when the sediment enters the sea,a great deal of sediment deposits in the new mouth;meantime,the old mouth is scoured acutely,and the thickness of depositing or scouring is less than 1m in the rest region.更多还原