洪泽湖水质2010—2020年时空变化特征
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X524

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江苏省水利科技项目(2019003)


Spatio-temporal variation of water quality in Hongze Lake from 2010 to 2020
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    摘要:

    基于2010—2020年洪泽湖逐月水质监测数据,采用最不利值法和距平系数法分析研究洪泽湖水质时空变化特征。结果表明:TN、CODMn和TP是洪泽湖水环境治理最重要的控制因子。从时间维度上看,洪泽湖TN质量浓度逐月下降,CODMn质量浓度逐月稳定,TP质量浓度逐月先升后降;2010—2020年TN质量浓度逐年显著下降,TP质量浓度逐年小幅下降;TN最不利值逐年下降,枯水期对TN质量浓度的增高作用明显大于汛期,TP最不利值逐年小幅上升,多出现在8—10月,出现概率高达81.8%。从空间维度上看,淮安湖区TN和CODMn距平系数多为正数,宿迁湖区TN和CODMn距平系数均为负数;淮安湖区TP距平系数多为负数,宿迁湖区TP多为正数。现阶段,控氮治理及降低CODMn排放总量是淮安地区亟待解决的重点问题,宿迁地区亟待加强控磷治理。

    Abstract:

    The spatio-temporal variation of the water quality in Hongze Lake were studied with the least favorable value method and the anomaly coefficient method based on the monthly monitoring data from 2010 to 2020. The results show that TN, CODMn, and TP are the most important factors that affect the water environment of Hongze Lake. With regard to the temporal distribution, the monthly TN concentration in Hongze Lake decreased continuously, the monthly CODMn concentration gradually stabilized, and the monthly TP concentration increased first and then decreased. The annual TN concentration decreased significantly, while the annual TP concentration decreased slightly from 2010 to 2020. The least favorable value of TN showed a downward trend, with the dry season having a significantly greater effect on the increase of TN than the flood season. The least favorable value of TP showed a slight upward trend, which mainly occurred in August, September, and October, with a probability up to 81.8%. With regard to the spatial distribution, the TN and CODMn anomaly coefficients in the lake area in Huai’an were mostly positive, while the coefficients in the lake area in Suqian were mostly negative. The TP anomaly coefficient was mostly negative in the lake area in Huai'an, while mostly positive in the lake area in Suqian. Currently, control of TN and reduction of the total emissions of CODMn are the two prominent issues needed to be addressed in the Huai'an area, and TP control is an urgent issue to be strengthened in the Suqian area.

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姚敏,毛晓文,孙瑞瑞.洪泽湖水质2010—2020年时空变化特征[J].水资源保护,2022,38(3):174-180.(YAO Min, MAO Xiaowen, SUN Ruirui. Spatio-temporal variation of water quality in Hongze Lake from 2010 to 2020[J]. Water Resources Protection,2022,38(3):174-180.(in Chinese))

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  • 在线发布日期: 2022-05-20
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