作　　者： ; ; ; ;

机构地区： 中山大学地理科学与规划学院河口海岸研究所

出　　处： 《泥沙研究》 2011年第1期45-50,共6页

摘　　要： 将西江磨刀门水道1962、1977、1999年的河道地形图数字化,建立磨刀门水道三个年份的水下数字高程模型(DEM),在此基础上将河道分为上、中、下三段进行了河床演变及其成因分析。结果表明:磨刀门水道1977年前后河道发生过明显的河道冲淤转化;1962年至1977年磨刀门水道处于淤积状态,淤积量达9.92×106 m3,河道上游向窄深发展,下游则向宽浅演变;而从1977至1999年磨刀门水道则处于冲刷状态,冲刷量为25.53×106 m3,河道平均水深增加,逐渐向窄深演变。磨刀门水道河床演变是自然环境变化和人类活动共同作用的结果,其中人类活动的影响最为强烈。 Quantitative analysis of the characteristics of evolution of the Modaomen channel of the Xijiang River China in the past 40 years is performed with the help of DEM.The Modaomen channel was divided longitudinally into three small sections.Three pieces of charts of the Modaomen channel in 1962,1977 and 1999 were digitized respectively and the digital elevation models（DEM） of the Modaomen channel in different periods were established with Kringing gridding method.Based on them,the evolution pattern of the river channel as well as the reasons of the evolution is analyzed.The result indicates that the Modaomen channel experienced an obvious switch from deposition to erosion around 1977.From 1962 to 1977,the general trend was deposition,and the total deposition volume was 9.92 × 106m3,what＇s more,the upper channel became narrower and deeper and the lower channel became wider and shallower.From 1977 to 1999,the general treand was erosion,and the total erosion volume was 22.53 × 106m3,additionally,the mean water depth of the channel increased and the channel turned out to be narrower and deeper.The evolution of the Modaomen channel was influenced by the change of natural river environment and human activities,but the latter was more important.

关 键 词： 磨刀门水道 数字高程 河床演变 人类活动

领　　域： [水利工程]