中文摘要：

基于1960s、1980s和2010s的三期水系数据,通过构建定量描述河流水系变化特征的指标体系,对嘉兴市河流水系的时空变化特征及其与城市化的关系进行研究。结果表明：1近50年来,嘉兴市的河流水系呈现出剧烈衰减的趋势,其中河流发育系数、河网密度和水面率分别减少了58.91%、28.49%和14.09%,但在城市化不同阶段,河流水系衰减的程度并不完全一致。2在整个城市化进程中,河流发育系数和干流面积长度比变化的空间差异非常大,河网密度和水面率变化的空间差异相对较大,而盒维数和河流曲度变化的空间差异相对较小。3河流发育系数、盒维数和河网密度的衰减趋势为城区〉近郊〉远郊,水面率的衰减趋势为远郊〉近郊〉城区,河流曲度的衰减趋势为近郊〉城区〉远郊,但干流面积长度比的空间变化趋势不明显。4城市化对河流水系变化的影响十分显著,且城市化水平越高的地区河流水系的变化越剧烈,而城市化对干流面积长度比与河流曲度的影响大于其对河流发育系数与河网密度的影响。

英文摘要：

Based on the river system data in the 1960 s, 1980 s and 2010 s, the indicator system of quantitative description of river systems change characteristics was established, then the spatial-temporal changes of river systems and its relationship with urbanization in Jiaxing over the past 50 years was analyzed. Results indicated that：（1） Over the past half century, river systems of Jiaxing showed a decline trend. Specifically, the river development coefficient,river density and water surface ratio decreased by 58.91%, 28.94% and 14.09%, respectively.However, the degradation of the river systems varies in different urbanization stages.（2） In the whole urbanization process, the spatial differences of the changes of the river development coefficient and main river area length ratio were extremely large, and the spatial differences of the changes of the river density and water surface ratio were larger, but the spatial differences of the changes of the box dimension and river sinuosity were relatively small.（3） The decline trend of the river development coefficient, box dimension and river density was more significant in the urban area than that in the suburbs and outer suburbs, the decline trend of the water surface ratio was more significant in the outer suburbs than that in the suburbs and urban area, and the decline trend of the river sinuosity was more significant in the suburbs than that in the urban area and outer suburbs, but the spatial change trend of the main river area length ratio was insignificant.（4） The impacts of urbanization on river systems changes were extremely significant, and the changes of river systems were more drastic in higher urbanization level regions, but the impacts of urbanization on main river area length ratio and river sinuosity were larger than that on river development coefficient and river density.