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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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长江中游马口—田家镇河段40年来河道演变
DOI: 10.11821/xb200701007, PP. 62-71
Keywords: 长江,马口—田家镇河段,GIS,DEM,模型,河道演变
Abstract:
运用地理信息系统(GIS)与数字高程模型(DEM)分析了马口—田家镇河段1963年、1972年与2002年河道地形数据,较为系统地研究了该河段过去40年冲淤时空变化。研究结果认为,1972年与1963相比冲刷量达到789.9hm3,冲刷面积为39.7×104m2;2002年与1963年相比冲刷量达到1196.5hm3,冲刷面积为59.4×104m2;2002年与1972年相比冲刷量达到960hm3,冲刷面积为54.3×104m2。由以上结果认为,马口—田家镇河段近40年来以冲刷为主;河道冲淤变化以马口卡口与田家镇卡口等窄深河段最为剧烈,宽浅河段与顺直河段冲淤变化较为和缓,冲淤变化幅度不大;卡口上、下端以淤积过程为主,而卡口顶冲水流的顶弯部位以冲刷过程为主。研究河段冲淤变化受上游来水来沙条件影响很大,对未来三峡工程建成后,三峡大坝下游来水来沙以及研究河段冲淤变化的影响研究提供借鉴。
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