| 引用本文: | 朱广伟,秦伯强,张路,罗潋葱,孙小静,洪大林,高亚军,谢瑞.太湖底泥悬浮中营养盐释放的波浪水槽试验.湖泊科学,2005,17(1):61-68. DOI:10.18307/2005.0110 |
| ZHU Guangwei,QIN Boqiang,ZHANG Lu,LUO Liancong,SUN Xiaojing,HONG Dalin,GAO Yajun,XIE Rui.Wave Effects on Nutrient Release of Sediments from Lake Taihu by Flume Experiments. J. Lake Sci.2005,17(1):61-68. DOI:10.18307/2005.0110 |
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| 太湖底泥悬浮中营养盐释放的波浪水槽试验 |
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朱广伟1, 秦伯强1, 张路1, 罗潋葱1, 孙小静1, 洪大林2, 高亚军2, 谢瑞2
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1.中国科学院南京地理与湖泊研究所, 南京210008;2.南京水利科学研究院, 南京210024
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| 摘要: |
| 波浪水槽中研究了小波掀沙(波高8.77cm,波周期0.8s)和大波掀沙(波高12.31cm和13.29cm,波周期1.0s)对太湖沉积物悬浮及N、P营养盐释放的作用规律.结果显示:小波掀沙时,底泥并未发生大量悬浮,SS浓度最高时仅13.6mg/L;大波掀沙时,底泥大规模悬浮,SS浓度最高达达245.2mg/L水体悬浮物、营养盐浓度变化滞后波高变化1h以上.当波高改变1h后,水体悬浮物、N、P营养盐浓度才改变到相应的平衡浓度.除总磷浓度显著提高外,小波掀沙对水体N、P浓度的影响很小,大波掀沙则显著提高了水体总氮、总溶解氮、总磷、总溶解磷、氨氮(NH4+-N)、溶解性活性磷(SRP),其中NH4+-N、SRP最大增幅达30%和20%.小波和大波掀沙过程中,水体溶解氧浓度均持续增加,掀沙2h后增高2mg/L,溶解性有机碳持续下降,2h后下降33%-51%.试验结果表明,掀沙过程中水体充氧及颗粒物的絮凝、吸附作用可能是限制NH4+-N、SRP浓度增高的重要因素之一. |
| 关键词: 水动力 沉积物 再悬浮 营养盐 内源释放 波浪水槽 太湖 |
| DOI：10.18307/2005.0110 |
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| 基金项目:中国科学院知识创新项目(KZCX1-SW-12)和中国科学院南京地理与湖泊研究所所长基金项目联合资助. |
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| Wave Effects on Nutrient Release of Sediments from Lake Taihu by Flume Experiments |
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ZHU Guangwei1, QIN Boqiang1, ZHANG Lu1, LUO Liancong1, SUN Xiaojing1, HONG Dalin2, GAO Yajun2, XIE Rui2
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1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Nanjing Hydraulic Research Institute, Nanjing 210024, P. R. China
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| Abstract: |
| The effect of wave disturbance on the nutrient release from lake sediraents was simulated in flume experiments.The sediments were sampled from Lake Taihu, China, which is a large, shallow, eutrophic lake with a mean depth of 1.9 m and an area of 2447 km2.The water flume was 30 m long, 0.5 m wide and 0.7 m deep.The sediments was 10 cm thick in the bottom of water flume in flume experiments.In a "little-wave" experiment, which means the wave height just a bit higher than the critical wave height for sediment resuspension, the depth of overlying water was 40 cm, the critical wave height for sediment resuspension was 8.45 cm, and the wave height for sediment resuspension experiments was 8.77 cm.In a "strong-wave" experiment,thedepthofo-verlying water was 30 cm, the critical wave height for sediment resuspension was 5.93 cm, and the wave height for sediment resuspension experiments was 12.31 cm and 13.29 cm.In the 41 little-wave.experiments, contents of suspended solids (SS) was increased to 13.6 mg/L, while in strong-wave experiments, the SS content was increased to 245.2 mg/L.The equilibrium of the con-eentration of nutrients and SS in overlying water was lag more than 1h than the change of wave height.Strong wave disturbance significantly increased the concentrations of ammonia nitrogen and soluble reactive phosphorus in overlying water.In both the little-wave experiment and strong-wave experiment, concentrations of dissolved oxygen in overlying water was increased and concentrations of dissolved organic carbon in overlying water decreased.The study indicated that strong wave might caused significant increase of internal loading of nutrients.However, flocculation and adsorption of resuspended sediments and the oxygenate action accompany by the wave disturbance may district the increasing of reactive nutrients in overlying water. |
| Key words: Hydrodynamics sediments resuspension nutnents internal loading wave flume experiment Lake Taihu |
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