【Key words】 Land use structure change; Sustainable land use; Grey systemic model; Hengyang City
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The modeling result shows that land use structure and pattern change results in the increase of maxi- mum flood peak and flood discharge and the decreases of runoff concentration time.
模拟结果表明，土地利用结构与格局的变化，使得暴雨洪水的最大洪峰流量和洪量加大，汇流时间变短。
The structure of land use of studied region changes in evidence from 1997 to 2003, and the rate of change dynamic of land use is very high.
2003年研究区域的土地利用结构发生明显变化，土地利用变化动态度大。
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