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首页> 外文会议>IAHR International Symposium on Ice >Water Quality Characteristics of Ice-covered, Stagnant, Eutrophic Water Bodies as Influenced by Climate Change
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Water Quality Characteristics of Ice-covered, Stagnant, Eutrophic Water Bodies as Influenced by Climate Change

机译：受气候变化影响的冰盖，停滞，富营养化水体的水质特征

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This study clarifies the water quality characteristics of stagnant, eutrophic water bodies that freeze over in winter, based on our surveys and simulations, and examines how climate change may influence those characteristics. The surveys found that climate-change-related increases in water temperature were suppressed by ice covering the water area, which also blocked oxygen supply. It was also clarified that the bottom sediment consumed oxygen and turned the water layers anaerobic beginning from the bottom layer, and that nutrient salts eluted from the bottom sediment. These eluted nutrient salts were stored in the water body until the ice melted. Climate change was surveyed as having caused decreases in nutrient salts concentration because of the shortened ice-cover period; however, Biological Oxygen Demand (BOD) showed a tendency to increase in spring with the proliferation of phytoplankton that was promoted by the climate- change-related increase in water temperature. To forecast water quality by using these findings, particularly the influence of climate change, we constructed a water quality simulation model that incorporates the freezing-over of water bodies. The constructed model shows good temporal and spatial reproducibility and enables water quality to be forecast throughout the year, including the ice-cover period. The forecasts using the model agree well with the survey results of shortened ice period and climate-change-related increase in BOD in spring.
机译：本研究阐明了冬季冻结的慢性水体的水质特征，基于我们的调查和模拟，并检查气候变化如何影响这些特征。该调查发现，通过覆盖水域的冰块抑制了水温的气候变化相关的增加，这也阻塞了氧气供应。还澄清了底部沉积物消耗氧气，并从底层开始厌氧，从底部沉积物洗脱营养盐。将这些洗脱的营养盐储存在水体中，直至冰熔化。由于缩短了冰盖期，调查了气候变化因营养盐浓度而导致营养盐浓度降低;然而，生物需氧量（BOD）显示出春季增加的趋势，具有通过气候变化相关的水温升高而促进的浮游植物的增殖。通过使用这些调查结果来预测水质，特别是气候变化的影响，我们构建了一种融合水体的水质模拟模型。构造的模型显示出良好的时间和空间再现性，并能够全年预测水质，包括冰盖。使用该模型的预测与春季缩短冰期和气候变化相关的调查结果吻合。

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