Residual effects of treated effluent diversion on a seaweed farm in a tidal strait using a multi-nested high-resolution 3-D circulation-dispersal model

Uchiyama Y 1 , Zhang X 2 , Suzue Y 2 , Kosako T 3 , Miyazawa Y 4 , Nakayama A 5

Affiliations 

  • 1 Department of Civil Engineering, Kobe University, Kobe, Japan; Coastal and Estuarine Environmental Department, Port and Airport Research Institute, Yokosuka, Japan. Electronic address: uchiyama@harbor.kobe-u.ac.jp
  • 2 Department of Civil Engineering, Kobe University, Kobe, Japan
  • 3 Coastal and Estuarine Environmental Department, Port and Airport Research Institute, Yokosuka, Japan
  • 4 Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • 5 Department of Environmental Engineering, Universiti Tunku Abdul Rahman, Kampar, Perak, Malaysia
Mar Pollut Bull, 2018 May;130:40-54.
PMID: 29866568 DOI: 10.1016/j.marpolbul.2018.03.007

Abstract

A high-resolution 3-D model was developed to assess the impact of a diversion outfall at the Tarumi Sewage Treatment Plant (TSTP) on an adjacent seaweed farm in Osaka Bay, Japan. The model was extensively validated to ensure a reasonable agreement with in situ observations. The western part of the farm is largely influenced by tidal currents, whereas the eastern area is mainly affected by subtidal residual currents that are primarily due to surface wind stress. The released effluent is transported by counterclockwise residual circulation formed off the TSTP. The model reveals that the diversion adequately suppresses the influence on the farm. While the instantaneous effluent concentration is diminished by about 50%, the effluent accumulated on the farm decreased from 2.83 × 104 m3 to 2.01 × 104 m3 due to the diversion, demonstrating an approximately 28% reduction of the effluent from the TSTP by the diversion outfall.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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