Characteristics of sediment resuspension in Lake Taihu, China: A wave flume study

被引:38
作者
Ding, Yanqing [1 ,2 ]
Sun, Limin [1 ,3 ]
Qin, Boqiang [2 ]
Wu, Tingfeng [2 ]
Shen, Xia [4 ]
Wang, Yongping [4 ]
机构
[1] China Univ Min & Technol, Sch Resource & Geosci, Xuzhou 221116, Jiangsu, Peoples R China
[2] Chinese Acad Sci, State Key Lab Lake Sci & Environm, Taihu Lab Lake Ecosyst Res, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China
[3] Beijing Normal Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100875, Peoples R China
[4] Nanjing Hydraul Res Inst, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210029, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Wave flume; Shear stress; Sediment resuspension; Sediment dredge; Nitrogen; Phosphorus; LARGE SHALLOW LAKE; NUTRIENT RELEASE; MEILIANG BAY; PHYTOPLANKTON GROWTH; PHOSPHORUS RELEASE; EUTROPHIC LAKE; DYNAMICS; WATER; NITROGEN; FLUXES;
D O I
10.1016/j.jhydrol.2018.04.026
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Lake Taihu is a typical shallow lake which frequently happens sediment resuspension induced by wind-induced waves. The experiments are carried on to simulate the wave disturbance processes in wave flume by setting a series of wave periods (1.2 s, 1.5 s, 1.8 s) and wave heights (2 cm, 10 cm). It aims to analyze the characteristics of sediment resuspension and the mechanisms of nutrients release and to evaluate the effects of sediment dredging on sediment resuspension and nutrients release in Lake Taihu. The results show that wave shear stress during 2 cm and 10 cm wave height processes ranges 0.018-0.023 N/m(2) and 0.221-0.307 N/m(2), respectively. Wave shear stress has no significant differences between wave periods. Wave height has much more effects on sediment resuspension. Wave height of 2 cm could induce total suspended solids (TSS) reaching up to 5.21 g/m(2) and resuspension flux of sediment (M) up to 1.74 g/m(2). TSS sharply increases to 30.33-52.41 g/m(2) and M reached up to 48.94 g/m(2) when wave height reaches to 10 cm. The disturbance depth under different sediment bulk weights ranges from 0.089 to 0.161 mm. Variation of suspended solids in 3 layers (1 cm, 5 cm, 20 cm above sediment interface) has no significant differences. Organic matter, TN and TP have positive relationship with SS. Organic matter is only accounted for 5.7%-7.3% of SS. The experiments under different sediment bulk densities (1.34 g/cm(3), 1.47 g/cm(3) and 1.59 g/cm(3)) find that TSS and M fall by 44.2% and 39.8% with sediment bulk density increasing, respectively. Total TN, DTN, TP and DTP decrease by 24.3%-33.6%. It indicates that sediment dredging could effectively reduce SS concentration and nutrient levels in water column. The researches provide a theoretical basis for sediment dredging to control the shore zone of Lake Taihu for lake management.
引用
收藏
页码:702 / 710
页数:9
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