Abstract:

The Taihu Lake Basin is highly developed area in urbanization of China.The development of urbanization boost regional economy effectively,which has inflicted a rather big impact on the original river water,and ecological environment as well.Suzhou is one of the most typical of urbanization development cities in the Taihu Lake Basin.In last few decades,the rapid development of urbanization led to the atrophy of regional stream network,and hydrographic net blocked as well.To analyze the water structure and changes in river connection,graph and GIS method have been used.The study shows that:(1)in the recent 50 years,the length of the streams of the study area reduced about 84 km,and the drainage density decreased about 197%;(2)the jurisdiction of two,three stream continued to decrease,while the jurisdiction of one stream grew constantly,which became a predominant role in the urban area;(3)stream nodes and links showed a downward trend,and the variance from 1980s to 2009 was much greater than that from 1960s to 1980s;(4)stream connectivity in 1960s was 4215 down to 4017 in 1980s, by 2009 it dropped to 3361,showing a clear decreasing trend