simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities

	simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities
	Tong Yali; Liang Tao; Wang Lingqing; Li Kexin
刊名	journalofgeographicalsciences
	2017
卷号	27 期号:6 页码:697
ISSN号	1009-637X
英文摘要	Since the construction of the Three Gorges Dam, the Poyang Lake hydrological characteristics obviously changed. During the impoundment period of the Three Gorges Reservoir, the hydrodynamic factors of Poyang Lake varied. Water level dropped, the velocity decreased and water exchange time lengthened, which changed the release of phosphorous from sediments. In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments, we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities. We found that both water level rising and velocity increasing could enhance the disturbance intensity to sediments, which caused the increase of suspended solids (SS) concentration, total phosphorus (TP) concentration in the overlying water, and the ability that phosphorus released to overlying water from sediments enhanced as well: when overlying water velocity maintained 0.3 m/s, SS concentration increased to 4035.85 mg/L at the water level 25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2 times that of the value at 10 cm; when water level maintained 15 cm, SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s, and TP concentration in the overlying water increased from 0.11 mg/L to 0.44 mg/L. When the water level maintained 15 cm, the phosphorous release rate reached the maximum value of 4.86 mg/(md) at 0.4 m/s. The concentration of total dissolved phosphorous(TDP) and soluble reactive phosphate (SRP) both in overlying water and sediment-water interface were negatively correlated with pH. Using the parabolic equation, the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm, and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.
语种	英语
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/127951]
专题	中国科学院地理科学与资源研究所
作者单位	中国科学院地理科学与资源研究所
推荐引用方式 GB/T 7714	Tong Yali,Liang Tao,Wang Lingqing,et al. simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities[J]. journalofgeographicalsciences,2017,27(6):697.
APA	Tong Yali,Liang Tao,Wang Lingqing,&Li Kexin.(2017).simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities.journalofgeographicalsciences,27(6),697.
MLA	Tong Yali,et al."simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities".journalofgeographicalsciences 27.6(2017):697.