Analysis of Salinity Behavior in Hakata Bay after Heavy Rainfall Using a Three-dimensional σ-Coordinate Model

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

Massive freshwater discharges due to heavy rainfall have recently caused negative changes to coastal waters, such as red tides and anoxic water masses. In this research, a salinity analysis was conducted using a three-dimensional σ-coordinate model to evaluate the impact of large freshwater discharges on the horizontal and vertical distribution of salinity. Specifically, Hakata Bay was examined after a heavy rainfall with a six-year return period, beginning 16 September 2002, a common recurrence interval. The data were calculated for 11-27 September 2002. Tank models were applied to calculate river inflow discharges, which were considered river inflow in the hydrodynamic and salinity diffusion model for Hakata Bay. Model validation results showed high reproducibility, and the calculated tidal current and salinity agreed well with observed data. Results also showed that: (1) salinity was less than 15.0 psu at the river mouths about one day after heavy rainfall; (2) low-salinity water (< 28.0 psu) spread across the surface of the inner part of the bay; and (3) salinity differences between the surface and bottom were large (approximately 4 psu) and lasted three days after the heavy rainfall. It was concluded that red tides and anoxic water masses could be induced in the inner part of the bay.

作成者 Akihiro FUKUDA Toshinori TABATA Kazuaki HIRAMATSU Masayoshi HARADA
著者キーワード coastal sea freshwater discharge hydrodynamic and salinity diffusion model tank model
公開者 Japan International Research Center for Agricultural Sciences
受付日 2019-10-15
受理日 2020-07-21
国立情報学研究所メタデータ主題語彙集(資源タイプ) Article
開始ページ 137
終了ページ 146
DOI 10.6090/jarq.55.137
言語 eng