河网密度，指流域内干支流总河长与流域面积的比值或单位面积内自然与人工河道的总长度。
平原地区一般河网密度高，河道比降小，水流流泄不畅，极易造成内涝灾害。
In the plain area, because of the channel density is large and the slope of riverbed is small, the channel flow is slow and the waterlogging often occurs.
对贵州省喀斯特地貌进行了特征分析，讨论了喀地貌类型及其与人口、经济、植被和河网密度等的关系。
The karst topography in Guizhou province is analysed, the topographic sorts and correlations among population, GDP, vegetation and drainage density are portrayed respectively.
研究结果表明，在算法中不同的流域应取不同的阈值，所取阈值的范围对提取出的河网密度、精细度等有着巨大的影响。
The results show that the algorithm in different basins should take a different threshold. The scope of the threshold affect the density and precision of the extracted network widely.
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