[Suspension-sedimentation of sediment and release amount of internal load in Lake Taihu affected by wind].
The water quality in Meiliang Bay of the Taihu Lake was totally tested five times in the four seasons. The suspension samples were obtained by using a sediment trap. The sediment settling flux and resuspended flux were calculated according to the observation data by using Gansith formula, and the relationships between these fluxes and wind speeds were established. Seven experiments were conducted in Laboratory for hydrostatic settling behavior of suspended matter affected by different wind speeds in Lake Taihu. The hydrostatic settling fluxes of suspended matter were calculated and the relationships between the fluxes and suspended matter concentrations were established. Base on these works, the suspension-sedimentation process was decomposed and generalized according to the critical wind speed of 3.7 m/s. Daily sediment resuspended amount and settling amount of the year 2005 was calculated and annual average release amount of internal load in Lake Taihu was estimated using the wind data of nearly 10 years. The results indicate that daily release amount of internal load in Lake Taihu significantly influenced by wind and have the same trend of change with wind, while the release amount of different nutrients in the same condition are different. The Lake Taihu has an annual average release amount of internal load with COD 49,600 t, TN 7773.0 t and TP 275.5 t, of which summer has the markedly highest release amount than other seasons.
Pang
Yong
Y
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China. ypang@hhu.edu.cn
Yan
Run-run
RR
Yu
Zhong-bo
ZB
Li
Yi-ping
YP
Li
Rui-ling
RL
D002681:China; D004784:Environmental Monitoring / Q000379:methods; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis* / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D052638:Particulate Matter / Q000032:analysis; D010710:Phosphates / Q000032:analysis*; D014876:Water Pollution / Q000032:analysis*; D014919:Wind
D052638:Particulate Matter; D010710:Phosphates; D009584:Nitrogen