Flume simulation of wave-induced release of internal dissolved nitrogen in Taihu Lake,China

WU Tingfeng; QIN Boqiang; ZHU Guangwei; DING Yanqing; WANG Yongping; LUO Liancong; LI Wei; ZHANG Wenming

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Flume simulation of wave-induced release of internal dissolved nitrogen in Taihu Lake,China

机译：波浪导致太湖内部溶解氮释放的水槽模拟

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A wave flume simulator was used to study internal nitrogen release from the surface sediment collected from Taihu Lake,China.Particulate nitrogen concentrations were positively correlated with the concentrations of suspended solids,primarily from surface erosion related to the shear stress and duration of wave action.In response to 4 cm-and 10 cm-high wave production representing waves generated in Taihu Lake by gentle and gusty winds,respectively,the mean dynamic release rate of ammonium(NH+4)from the sediment to the overlying water was 1 × 10-3 mg/(m2·s)and the NH+4 concentration in the overlying water increased by 0.016 mg/L,indicating that waves resulting from strong wind can induce the rapid release of dissolved nitrogen from Taihu Lake sediments.The decrease in interstitial NH+4 concentrations at all sediment depths was associated with an increase in NH+4 concentrations in the overlying water by 0.01 mg/L,showing that sediment below the eroded layer was the main source of internal nitrogen release.Changes in the interstitial dissolved oxygen and NH+4 concentrations showed that wave-induced pore water movement can greatly increase the diffusion rate,and that these effects can influence the sediment to a depth of at least 15 cm.Diffusion induced by pore water movement may be very important for the formation of an active sediment layer in Taihu Lake.

机译：利用波浪水槽模拟器研究了从太湖收集的地表沉积物中的内部氮释放。颗粒氮的浓度与悬浮固体的浓度呈正相关，主要是与剪切应力和波浪作用持续时间有关的表面侵蚀。响应4 cm和10 cm高的波浪产生，分别代表太湖在微风和阵风中产生的波浪，铵态氮（NH + 4）从沉积物中向上覆水中的平均动态释放速率为1×10 -3 mg /（m2·s），上覆水中的NH + 4浓度增加0.016 mg / L，表明强风产生的波浪可以诱导太湖沉积物中溶解氮的快速释放。在所有沉积物深度的NH + 4浓度与上覆水中NH + 4的浓度增加0.01 mg / L有关，表明侵蚀层以下的沉积物是内部沉积的主要来源。氮释放。间隙中溶解氧和NH + 4浓度的变化表明，波浪引起的孔隙水运动可以大大增加扩散速率，并且这些作用可以影响沉积物至少15 cm的深度。孔隙水运动对于太湖活动性沉积物的形成可能非常重要。

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来源
《中国海洋湖沼学报（英文版）》 |2012年第5期|796-805|共10页
作者
WU Tingfeng; QIN Boqiang; ZHU Guangwei; DING Yanqing; WANG Yongping; LUO Liancong; LI Wei; ZHANG Wenming;
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State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;

Pearl River Hydraulic Research Institute,Pearl River Water Conservancy Commission,Guangzhou 510611,China;

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Flume simulation of wave-induced release of internal dissolved nitrogen in Taihu Lake,China

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