Abstract
Based on the observations of the Modaomen waterway in the dry season of 20172018 and the hydrometeorological data collected, the influence of runoff, tide and wind on the daily maximum intrusion length is analyzed here in order to researth the characteristics of saltwater intrusion in the Modaomen waterway in the dry season. Compared the daily maximum intrusion length calculated by formula with the observation, it can be found that the two were consistent. Through the correlation coefficient between intrusion length of saline water and flow rate, tide difference and wind, it is found that the movement trend of salinity borderline is determined by the stability of the upstream runoff. Under the condition that the upstream runoff is relatively stable, the movement trend of the salinity borderline is dominated by tide when discharge is high, and when discharge is low, the movement trend of salinity borderline is dominated by the interaction between tide and runoff. And the northerly wind promotes and accelerates the intrusion of the saltwater.
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