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Organic pollution in dammed river water in a low-precipitation region of Japan

机译：日本低降水地区堰塞河水中的有机污染

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摘要

Organic pollution in eutrophic river water dammed by estuary weirs was studied in the Shin and Kasuga rivers of the Shikoku region, Japan. Both rivers are located in a low-precipitation region of Japan. The investigation was performed at intervals of 3-14 days from 12 July 2002 to 13 July 2003. The annual averages of chlorophyll a concentration were approximately 150 and 40 μg L~(-1) in the Shin and Kasuga rivers, respectively. The concentration often exceeded 500 μg L~(-1) in the Shin River in winter. Dissolved oxygen saturation exhibited marked variation. High and low values, i. e., >150% in the surface water layer and 0% in the bottom water layer, were occasionally observed. Dissolved methane concentrations >2,000 nM were often observed from spring to fall. In both rivers, the serious organic substance pollution was confirmed through 1 year.
机译：在日本四国地区的Shin河和Kasuga河中研究了河口堰拦住的富营养河水中的有机污染。两条河流都位于日本的低降水地区。从2002年7月12日至2003年7月13日，每3-14天进行一次调查。Shin河和Kasuga河的年平均叶绿素a浓度分别约为150和40μgL〜（-1）。冬季，新河的浓度通常超过500μgL〜（-1）。溶解氧饱和度表现出明显的变化。高和低值，i。例如，偶尔观察到在地表水层中> 150％，在底部水层中> 0％。从春季到秋季经常观察到溶解的甲烷浓度> 2,000 nM。在两条河流中，经过1年的时间都确认了严重的有机物污染。

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