Monsoon effects on the residence time of a coastal lagoon in southwestern Taiwan

Hung Jen Lee, Pei Jie Meng, Chung Chi Chen, Kwee Siong Tew

Research output: Contribution to journalArticle

Abstract

A three-dimensional, high-resolution numerical model with tide-generating and wind forces was used to simulate a passive tracer to study the water mass flushing rate in a coastal lagoon— Tapeng Bay. Model results show that north–northwesterly monsoons in winter can suppress ebb tidal currents flowing northwestward and concurrently suppress lagoon water exchanges with open shelf water, leading to a poor flushing rate. By contrast, both the westerly and southeasterly prevailing wind conditions in summer allowed lagoon water to mix, producing long-distance motion in the form of tidal residual currents from the southeast toward the northwest of the bay. This wind stress disturbance induced a horizontal mixing of the longitudinal lagoon water and led to greater water mass exchanges between Tapeng Bay and the open shelf. Therefore, tide-generating forces and suitable monsoons crucially influence the residence time of water mass in coastal lagoons.

Original languageEnglish
Article number106535
JournalEstuarine, Coastal and Shelf Science
Volume233
DOIs
Publication statusPublished - 2020 Feb 5
Externally publishedYes

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Keywords

  • Coastal lagoon
  • Monsoon
  • Residence time
  • Tidal current
  • Tidal inlet
  • Tracer

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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