Investigatioh of Conditions Required to Construct an Artificial Shallow Area to Recover the Water Purification Function of a Hypoxic Sea

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  • 貧酸素化海域における水質浄化機能回復のための浅場造成手法に関する研究
  • ヒンサンソカ カイイキ ニ オケル スイシツ ジョウカ キノウ カイフク ノ タメ ノ アサバ ゾウセイ シュホウ ニ カンスル ケンキュウ

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Abstract

To create a new artificial shallow area in a hypoxic bay, we propose methods to determine the depth for the area and how to evaluate its effectiveness. The study was conducted in Mikawa Bay, Japan, which is a semienclosed sea and is regularly nutrient enriched. As a result, in summer, serious hypoxia is observed in the bottom layer, which becomes progressively lethal to the macrobenthos. Therefore the aim of developing a new shallow area should be to avoid hypoxia. To determine the depth of the shallow area to be newly created, we analysed field data such as macrobenthos, water temperature and dissolved oxygen concentration. We then used those results to estimate the survival rate of the short-necked clam (Ruditapes philippinarum), which depends on water temperature, dissolved oxygen concentration and glycogen content in the body. We proposed that the depth of the artificial area should be where the survival rate for the short-necked clam will be over 70%. The effect of constructing the shallow area was assessed on the basis of the water purification function, which is defined by the removal of particulate organic nitrogen by macrobenthos. All field data and numerical results, which predicted the effects of constructing the new shallow area, were managed in a Geographic Information System (GIS). The new methods and evaluation criteria presented in this paper have both environmental and economic merits.

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