Abstract
To investigate the respond of salt intrusion in Modaomen estuary to variations of river flow and fortnight tidal cycle in dry season, numerical simulation was applied to a simplified estuary model based on the geometries of Modaomen. Like many other estuaries, the intrusion length decreases as river flow increases. During neap tides the stratification is strong and exchange flow is remarkable in a longer intrusion length while during spring tides the minimum stratification occurs owing to enhanced turbulence in a shorter intrusion length. The salt transport presents landward during neap and seaward during spring. The advection timescales are smaller than fortnight period apparently for dry season flows and thus the intrusion responds to the spring-neap variation quickly in spite of some days lag. High flows result in shorter adjustment times which is reflected in smaller differences of intrusion lengths between neap and spring than low flows.
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