2005 Fiscal Year Final Research Report Summary
Recovery and Preservation technologies for the Environment of Tidal-Flat in the Ariake Sea
| Project/Area Number |
14208072
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
環境保全
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| Research Institution | KUMAMOTO UNIVERSITY |
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Principal Investigator |
TAKIKAWA Kiyoshi Kumamoto Univ., Research and Education Center of Coastal Environmental Science, Professor, 沿岸域環境科学教育研究センター, 教授 (80040450)
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| Co-Investigator(Kenkyū-buntansha) |
KIDA Kenji Kumamoto University, Dept.of Applied Chemistry and Biochemistry., Professor, 工学部, 教授 (00195306)
HASE Yoshitaka Kumamoto University, Faculty of Science., Professor, 理学部, 教授 (40040109)
AKIMOTO Kzumi Kumamoto University, Research and Education Center of Coastal Environmental Science., Associate Professor, 沿岸域環境科学教育研究センター, 助教授 (70222536)
MATSUDA Hiroki Kumamoto University, Faculty of Science., Associate Professor, 理学部, 助教授 (80274687)
KOIKE Katsuaki Kumamoto University, Dept.of Civil and Environmental Eng., Professor, 工学部, 教授 (80205294)
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| Project Period (FY) |
2002 – 2005
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| Keywords | Environment of Ariake Sea / Environment of Estuary / Richness index of Tidal Flat / Environmental reproduction / Denitrification of Tidal Flat / Environmental Changes of the Ariake Sea / 3-D Tidal current Analysis / Prevention of pollution |
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| Research Abstract |
(1)Field observation was conducted inside the artificial tidal flat to model the physical, chemical and ecological system in tidal flat for the preservation or recovery of the coastal environment in Ariake Sea. The external meteorological and tidal condition controls the sub-tidal lone to the supra littoral zone has been constructed naturally, and such topography from the sub-tidal zone to the supra littoral zone has been constructed naturally, and such topographical condition preserves a steady environmental condition for habitat.
(2)An automated weather station (AWS) was deployed in the tidal zone near the Kumamoto Port to observe the land and sea-surface interaction. The diurnal variation of the bottom soil temperature in the tidal zone was strongly controlled by the tidal cycle. Especially the set-up time of the exposition plays an important role in the botton soil heating and the energy and CO2 transfer into the atmosphere.
(3)Numerical methods for analyzing the form of tidelands an
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d their gullies were developed. Quasi-three dimensional ocean circulation model POM and MEC were applied to the simulation of current and material transport in the Ariake Sea.
(4)The sustainable method to recover the tidal flat polluted by the reductive matters were developed, due to leaching out and oxidizing the matters of the bottom soil with the oxygen rich sea water using tidal energy. Through batch test and column test in laboratory and in field column test, the ratio of COD reduction due to leaching and oxidizing of the bottom soil in column tests.
(5)Sulfur cycling by sulfate metabolizing bacteria such as Allochromatium and Thiobacillus, which can grow both in anaerobic and aerobic conditions, is the main metabolism in a tidal flat. After plowing the tidal flat, it is shown that aerobic bacteria become major microorganisms instead of sulfate metabolizing bacteria in clone analysis with 16S rDNA and number of Thiobaeillus-like bacteria increase in the analysis with nirS gene.
(6)This study clarified the environmental changes based on analyses of many core samples, pollen/diatom, and radiocarbon dating in late Pleistocene to Holocene of Kumamoto Plain and the southeastern part of Ariake Bay. Also analysis of diatom from the bottom sediments and the surface seawater suggested that an eutrophic condition of water in Ariake Bay started at 160-30 years ago in each area. We made clear the distribution patterns of the surface sediments and water masses in Ariake and Yatsushiro Seas, and published these characteristics as 2 sets of database.
(7)Prevention of pollution of the land level side is important for environmental reproduction of Ariake Sea / Yatsushiro Sea. The consciousness investigation were performed for an area along the shore / a basin range local governments of both seas. Based on these investigations, we suggested a scheme to manage environment reproduction business and an area activation business by activation and the yield of taxes increase / finance reinforcement of the collection of environmental reproduction cooperation money and regional economy activity by introduction of a community currency with this generally.
(8)To detect spatio-temporal changes of a closed sea area in detail, two techniques of geoinformatics, (1)remote sensing and (2)geostatistics, have been developed in this study. High estimation accuracy of the proposed method was demonstrated, and seasonal change patterns of the sea surface temperature in a year and also temporal changes were clarified. These methods could draw appropriate distributions of sea surface temperature and nutritive salts during the 25 years for sparse data areas. Less
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