An Exploration of Geoenvironmental Condition of the Ariake Sea, Japan
  • 【摘要】

    Ariake Sea is famous for its various kinds of fisheries products and Porphyra sp. (sea weed) cultivations. But a dramatic decrease of catch of shells is observed for the last 3 decades in the Ariake S... 展开>>Ariake Sea is famous for its various kinds of fisheries products and Porphyra sp. (sea weed) cultivations. But a dramatic decrease of catch of shells is observed for the last 3 decades in the Ariake Sea. The unfavorable geoenvironmental condition of the Ariake Sea is the most liable for this declination. In order to investigate the geoenvironmental condition of the Ariake Sea a regular monitoring was carried out both in the tidal flat area and inside the sea from 2002 to date. Some predetermined sampling points fixed by global positioning system (GPS), were selected for collecting the mud sample. The major geoenvironmental properties of the Ariake Sea mud such as sulphide content (SC), oxidation-reduction potential (ORP),pH, salinity were measured in different specified layers by using steel tube sampler (0.9 m long, 0.07 m diameter) regularly. The high sulphide content of the mud is found to be one of the most important causes for unfavorable geoenvironmental condition for the benthos in the Ariake Sea. A laboratory test was carried out by mixing the acid in different concentrations with mud and executed a survival test for Sinonovacula constricta and Ruditapes philippinarum shells. The deterioration of the mud quality was increased with increasing the concentration of the acid and no survival of both types of shells was observed after 10 days. The sulphide content seems to be decreasing annually but still it is above the favorable limit for the benthos living in the tidal flat mud. 收起<<

  • 【作者】

    M. A. Moqsud  S. Hayashi  Y.J. Du 

  • 【语种】

    eng

  • 【会议名称】

    17th International Offshore and Polar Engineering Conference (ISOPE-2007)

  • 【会议地点】

    Lisbon, Portugal

  • 【会议时间】

    2007-01-01

  • 【关键词】

    Ariake Sea  geoenvironmental  tidal flat mud  sulphide content  oxidation reduction potential  acid treatment practice INTRODUCTION The Ariake Sea having a unique feature is