Research Study and Suggestion on the Regeneration of Tidal Flat Environment at Fujimae Tidal Flat in Nagoya Port

藤前潮滩有一个宽150m、长400m、深6m的盆地。夏季盆地水分层强烈，缺氧水在盆地内积聚。但是像台风这样的强湍流会把盆地里溶解氧不足的水溢出到周围的潮滩。在本研究中，我估计了气象湍流对盆地水分层的影响以及对潮滩环境的影响。伊势三川湾的另一个环境问题是夏季海湾一半以上面积的底层持续缺氧环境。这种环境恶化是由于滩涂和浅海地区的填海造成的。因此，我研究和监测了东海海岸中部国际机场岛（580ha）和前岛岛（130ha）填海后的水质变化，并与其他研究人员合作研究了海底沉积物质量的变化……More y和底栖动物。2002年8月22日在藤ae盆地的观测结果证实，13号台风引起的气象湍流使盆地水柱混合，造成10 ~ 15%的氧饱和度，对周围滩涂环境造成严重破坏。另一方面，8月12日，就在十号台风接近伊泽湾最近处后，在海盆没有观察到湍流。这次台风从大阪湾经过北陆地区，带来了南风，在伊势湾没有产生大的湍流。在退潮前和退潮后对富士海滩涂沉积物孔隙水进行采样，以评估微生物的硝化、反硝化、硫酸盐还原和硫氧化等活性。孔隙水分析表明，随着有机质供给量的增加，春季至夏季潮泥中硫酸盐还原成为主要的微生物分解过程。沉积物孔隙水分析显示，低潮后NH_4+减少，PO_4^<3->增加，提示低潮期间应促进铵态氧化和有机物降解。空港岛周边水质观测表明，空港岛填海后海洋环境恶化。尽管2002年10月中旬开始出现水柱混合，但有一个12m深度站（St.K1）的底部氧饱和度达到50%。但在2003年同期，另外两个深度为12m （St.K2）和15m （St.A10）的站点的氧饱和度下降到50%。由于机场岛的填海工程导致环境恶化，我们强烈建议在伊势和三川湾重建失去的潮滩或浅海地区。少

There is a basin with 150m width, 400m length and 6m depth in the Fujimae tidal flat. Water in the basin is so strongly stratified during summer season that anoxic water is accumulated in the basin. But a strong turbulence such as a typhoon would spill out the basin water with poor dissolved oxygen into the surrounding tidal flat. In this study I estimated the effect of meteorological turbulence on the stratification of the basin water and also on the tidal flat environment. Another environmental problem in the Ise-Mikawa Bay is the persistence of poor oxygen environment in the bottom layer of more than half area of the Bay during summer.This environmental deterioration is due to the reclamation of tidal flat and shallow marine region. So that I have researched and monitored changes in water qualities after the reclamation of Chubu International Air Port Island (580ha) and Mae-Jima Island (130ha) at Tokoname shore, co-working with other research on the changes of bottom sediment qualit … More y and benthic fauna.From the results of observation at Fujimae basin on 22 August in 2002, it was confirmed that a meteorological turbulence by typhoon No.13 mixed the water column of the basin and resulted 10-15% of oxygen saturation which affected severe damage on the surrounding tidal flat environment. On the other hand, on 12 August, just after the typhoon No.10 approached nearest to Ise-Bay, no turbulence was observed at the basin. In this case, the typhoon passed through from Osaka-Bay to Hokuriku region and brought the southern wind which did not make large turbulence in the Ise-Bay.Sediment pore water was sampled before and after the low tide at Fujimae tidal flat in order to estimate microbial activities such as nitrification, de-nitrification, sulfate reduction and sulfur oxidation. Analysis of pore water showed that sulfate reduction became major microbial decomposition process in the tidal mud from spring to summer with increase of organic matter supply. Analysis of sediment pore water also showed NH_4+ decreases and PO_4^<3->increases after the low tide which suggested that ammonium oxidation and organic matter degradation should be stimulated during the low tideWater quality observations around the Air Port Island off Tokoname suggested a deterioration of marine environments after the reclamation of Air Port Island. In spite of the beginning of water column mixing at the middle of October in 2002, one station with a depth of 12m (St.K1) showed 50% of oxygen saturation at the bottom. But at the same period in 2003, oxygen saturation at two more stations with a depth of 12m (St.K2) and 15m (St.A10) decreased to 50%. From these environmental deterioration by the reclamation of Air Port Islands, it is strongly recommended to regenerate lost tidal flats or shallow marine regions in Ise and Mikawa Bay. Less