| 汛末蓄水期神农溪库湾倒灌异重流特性及其对水华的影响 |
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| 引用本文： | 吕林鹏,纪道斌,龙良红,王 雄,宋林旭.汛末蓄水期神农溪库湾倒灌异重流特性及其对水华的影响[J].水生态学杂志,2018,39(1):9-15. |
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| 作者姓名： | 吕林鹏 纪道斌 龙良红 王 雄 宋林旭 |
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| 作者单位： | 三峡大学水利与环境学院,三峡大学水利与环境学院 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）,国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 为研究三峡水库神农溪库湾倒灌异重流特性、光混比特性及其对水华的影响,根据神农溪库湾的地理特性及库湾区域性水华特性,从神农溪河口至回水末端,沿渡河镇河道中泓线设置7个监测点位(SN01~SN06),于2014年汛末蓄水期对神农溪库湾的水温等指标进行跟踪监测分析。结果表明,三峡水库蓄水过程通过倒灌异重流作用,最大单日水位变幅为1.04 m,干流水体分别从表层、中上层和底层倒灌潜入库湾;倒灌异重流增强了干支流间水体交换,缩小了干支流间水温差,打破支流水温分层,使支流混合层深度逐步增大。库湾叶绿素a浓度呈现时空差异性,整个蓄水周期内,SN02受干流水体影响明显,叶绿素a浓度始终维持在低水平,均小于20 mg/m~3,蓄水过程中,SN05和SN06断面混合层深度由6.0 m上升至22.5 m,叶绿素a浓度由高于30 mg/m~3降低至10.30 mg/m~3,导致神农溪库湾叶绿素a浓度降低的主要原因是蓄水过程加强了干支流水体交换程度,减小光混比至0.2,库湾叶绿素a浓度均值降低为11.00 mg/m~3,水华情势最终得到有效控制。
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| 关 键 词： | 汛末蓄水 异重流 神农溪库湾 三峡水库 |
| 收稿时间： | 2016/9/21 0:00:00 |
| 修稿时间： | 2018/1/19 0:00:00 |
Effect of Reverse Slope Density Flow on Algal Blooms in Shennong Bay during Three Gorges Reservoir Impoundment |
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| LV Lin-peng,JI Dao-bin,LONG Liang-hong,WANG Xiong and SONG Lin-xu.Effect of Reverse Slope Density Flow on Algal Blooms in Shennong Bay during Three Gorges Reservoir Impoundment[J].Journal of Hydroecology,2018,39(1):9-15. |
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| Authors: | LV Lin-peng JI Dao-bin LONG Liang-hong WANG Xiong and SONG Lin-xu |
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| Institution: | College of Hydraulic Environmental Engineering,China Three Gorges University,College of Hydraulic Environmental Engineering,China Three Gorges University |
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| Abstract: | In order to investigate the dynamics of inverse density current, euphotic layer, mixing depth and their influences on the algal blooms in Shennong River(SNR), a typical tributary of Three Gorges Reservoir(TGR), water velocity, water temperature, Chl.a etc. were observed during the impounding period after flood season in 2014. It was showed that inverse density current from the mainstream of TGR drove strong water exchange in SNR. Meanwhile, the density current reduced the water temperature differences between the mainstream of TGR and SNR and the vertical thermal gradient in SNR as well. The mixing depth deepened resultantly, which deepened to 22.5 m at SN05 and SN06. The inverse density current and its environmental effects on the water exchange, the thermal dynamics in SNR, mixing depth were responsible for the decrease of algal blooms in SNR. In this study, the ratio of euphotic layer to mixing depth was reduced to 0.2 by the inverse density current followed by control of algal blooms in SNR finally. |
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| Keywords: | impoundment after the flood season reverse slope density flow Shennong Bay Three Gorges Reservoir |
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