乐安河源头考证

Investigation on the source of the Lean River

乐安河干流起点婺源县武口村以上有数条较大支流。根据历史考证以及航测图、本流域降水量、下垫而等因素，用水文比拟法估算出乐安河数条主流的多年平均径流量，从而得出古坦水和段莘水为乐安河两个并列源头的结论。

There are several big branches in the upper stream of Wukon village inWu Yuan county wbere the Lean River originates. According to studies of itshistory,the air map,the rainfall of this basin and the ground cover,the years’average water flow of the Lean River is estimated by the method of the hydrol-ogic comparsion,We can come to the conclusion that there are two sources aboutthe Lean River GuTan branch and DuanXin branch.