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克里金在珠江河道地形空间数据内插中的应用 被引量:9
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作者 杜国明 汪光松 +1 位作者 吴超羽 刘秋海 《中山大学学报(自然科学版)》 CAS CSCD 北大核心 2007年第1期119-122,共4页
使用数字化软件Geoway,对珠江河道地形图进行屏幕跟踪,得到高程点分布图,借助GIS的二次开发控件MapObject提取高程点坐标及高程值,再运用克里金内插方法,得到珠江河道阴影图、三维网格图以及剖面图,有助于形象地描述珠江河道地形的连续... 使用数字化软件Geoway,对珠江河道地形图进行屏幕跟踪,得到高程点分布图,借助GIS的二次开发控件MapObject提取高程点坐标及高程值,再运用克里金内插方法,得到珠江河道阴影图、三维网格图以及剖面图,有助于形象地描述珠江河道地形的连续起伏变化,为进一步研究珠江河道地形演变规律、预测其演化趋势提供有力的支持;另外,通过与移动平均内插法进行对比,得出克里金内插生成的剖面图相对平滑,且克里金内插法的误差可以计算出来,是一种更为理想的插值方法。 展开更多
关键词 克里金法 空间数据 内插 地理信息系统 珠江河道
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Dynamics of saltwater intrusion in the Modaomen Waterway of the Pearl River Estuary 被引量:12
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作者 WANG Biao ZHU JianRong +2 位作者 WU Hui YU FuJiang SONG XueJia 《Science China Earth Sciences》 SCIE EI CAS 2012年第11期1901-1918,共18页
Observations indicate an abnormal characteristic of saltwater intrusion in the upper Modaomen Waterway of the Pearl River Estuary,i.e.,the maximum salinity occurs during the neap tide or the coming moderate tide inste... Observations indicate an abnormal characteristic of saltwater intrusion in the upper Modaomen Waterway of the Pearl River Estuary,i.e.,the maximum salinity occurs during the neap tide or the coming moderate tide instead of during the spring tide.To explore the associated dynamic mechanisms,a high resolution three-dimensional numerical model was set up based on the Finite Volume Coastal Ocean Model(FVCOM),which covered the entire river network,the Pearl River Estuary,and the adjacent sea.Numerical experiments illustrated that the upper Modaomen Waterway is significantly influenced by the saltwater intrusion from the Hongwan Waterway,a narrow and shallow channel connecting the Modaomen Waterway to the sea.Specific topography,spring-neap tidal variation,local wind stress,and their interaction drive an up-estuary residual current in the Hongwan Waterway,which is much stronger during the neap tide than during the spring tide.As a result,more saltwater in the Hongwan Waterway is spilled over into the Modaomen Waterway during the neap tide or the coming moderate tide.This is the inherent dynamic mechanism why the saltwater intrusion in the upper Modaomen Waterway reaches its maximum during the neap tide or the coming moderate tide.Besides,we also found that the winter prevailing wind can pronouncedly enhance the saltwater intrusion in the Modaomen Waterway. 展开更多
关键词 Pearl River Estuary Modaomen Waterway saltwater intrusion abnormal characteristic dynamic mechanism
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