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simulationonphosphorusreleasecharacteristicsofpoyanglakesedimentsundervariablewaterlevelsandvelocities
Tong Yali; Liang Tao; Wang Lingqing; Li Kexin
2017
Source Publicationjournalofgeographicalsciences
ISSN1009-637X
Volume27Issue:6Pages:697
AbstractSince 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.
Language英语
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/127952
Collection中国科学院地理科学与资源研究所
Affiliation中国科学院地理科学与资源研究所
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
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.
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