城市景观格局与水文效应关系研究

Research on relationship between urban landscape pattern and hydrological effect

基于多时相TM/ETM+影像,运用支持向量机分类方法对蚌埠市景观进行分类,解译得到1989年、1995年、2003年和2007年土地利用专题图。采用景观指数法、转移矩阵法,分析了蚌埠市景观格局与城市水文效应之间的关系。研究表明:蚌埠市城市水文效应特征明显;耕地破碎化程度较低,连通性好,利于涵养水分和农业发展;建筑用地增加并有集中趋势,地表径流量增大;城市供水能力保持平稳,人均用水量相对减少,城市水质偏差。为此,调整城市景观格局,有利于改善城市水文状况。

Based on the multi-temporal TM./ETM ＋ images, the landscape of Bengbu City is classified with the SVM （ support vector machine）based classification method, and then the thematic maps for the land us of the years of 1989, 1995, 2003 and 2007 are obtained from the relevant interpretation. Moreover, the relationship between the urban landscape pattern and hydrological effect are analyzed with the landscape index method and the transfer matrix method. The study shows that the character of the hydrological effect of Bengbu City is obvious with lower fragmentation of plowland and better connectivity, which is favorable for water conservation and agricultural development; however, the land for construction increases along with trend of concentration, while the urban water supply capacity remains stable with the relevant decrease of the per capita water consumption and a bit poorer water quality. Therefore, the adjustment of the urban landscape pattern is favorable to improve the urban hydrological condition concerned.