长江径流变化对南港盐水入侵影响分析

EFFECTS OF FRESHWATER DISCHARGE AT THE DATONG STATION ON SALTWATER INTRUSION IN THE SOUTH CHANNEL OF THE CHANGJIANG ESTUARY

根据长江大通站长系列流量资料，按不同频率把枯季流量划分为丰、平、 枯、特枯四类，并与吴淞、高桥氯化物进行对比分析，表明南港河段每年受到盐水入 侵的影响，但入侵强度各年相差甚远，主要受控于径流量的丰竭。三峡工程兴建后 对长江口咸潮影响。既有不利的一面，又有有利的一面，建议水库调蓄方式根据实 际情况调整。

Eased on the data of long term river flow at the Datong station. The river water discharge of dry seasons can be divided into distinct regimen by depend on the frequency range: Plentiful, Ordinary, Dry, Extreme dry water, Compared with the affinity at Wusong and Gaoqiao sautions. It is show that influence of salt intrusion on the South channel exists in dry season of every years. But the intennsity of saltwater intrusion has obvious differences yearly. Because of variation of runoff in the Chsngjiang river. The effect of Three--Gorge Project on saltwater intrusion in the Changjiang estuary has both edvantageous side and disadvantageous side. It is suggested that regulating plan for water storage of Three--Gorge reservoir should be adjusted to actual case of water flow.