中文摘要：

根据沉积学原理和环境化学行为特点，应用地质积累指数（Igeo）法对杭州城区六条代表性河道底泥中典型重金属的含量进行了评价研究，从而为区域水环境的改善提供科学依据．结果表明：杭州城区河道底泥重金属地质积累指数分级在0-4级之间，Cd污染最严重，偏中度．偏重污染，其次是Zn，轻度一偏中度污染，Cu和Pb为轻度或无污染；不同区域重金属污染程度不一样，采荷断面受重金属污染的程度最大、义桥断面次之、蒋村港断面最小．

英文摘要：

In order to provide scientific basis for regional water environment improvement, the typical heavy metal content of river sediment sampled from six representative urban rivers in Hangzhou was evaluated via the index of Geo-accumulation Method （Igeo） according to the principles of sedimentology and the features of environmental chemical behavior. The re- sults showed that the Geo-accumulation index of heavy metals in river sediment rates between 0 and 4. Particularly, the Cd pollution is the most serious, which is graded as moderate-severe. The followed Zn pollution is mild-moderate, and Cu and Pb is mild or no pollution. Further more, the heavy metal pollution levels is different in different regions： Caihe Section is the most serious area, followed is Yiqiao Section, while Jiangcun Port Section is least.