Studies on the Hydrodynamic Processes and Related Factors in Meiliang Bay, Northern Taihu Lake, China

Qin, Boqiang; Hu, Weiping; Chen, Weimin; Fan, Chengxin; Jiang, Junyao; Chen, Yuwei; Xiyun, Gao; Yang, Liuyan; Gao, Guang; Huang, Wenyu; Jiang, Jiahu; Shen, Zhang; Liu, Yuanbo; Zhou, Ziyuan

doi:10.18307/2000.0406

Cited by 31 publications

(5 citation statements)

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“…Three kind intensities of wind forcings and the corresponding solid particulates concentration during Feb. 23, 25 and March 11, 1998, in Meiliang Bay were observed, and the results showed that the sediments would be resuspended on a large scale if the wind speed was no less than 6.5 m/s (Fig. 8) [58] . …”

Section: The Analysis Of Critical Shear Stress Of Sediment Resuspensimentioning

confidence: 94%

Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China

QINRoqiang¹,

HUWeiping²,

GAOGuang³

et al. 2004

Chinese Sci Bull

130

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On the basis of investigations in situ, it was found that mass exchange on the water-sediment interface occurred chiefly on the superficial sediment within 5 10 cm. The spatial physicochemical character of sediment was distributed uniformly. The observation of lake currents and waves indicated that the dynamic sources, which act on the interface of water and sediment, came mainly from waves under strong wind forcing, while the critical shear stresses due to the waves and currents were of the same magnitude under weak wind forcing. The critical shear stress that leads to extensive sediment resuspension was about 0.03 0.04N/m 2 , equivalent to a wind speed in situ up to 4 m/s. If a dynamic intensity exceeded the critical shear stress, such as a wind velocity up to 6.5 m/s, massive sediment re-suspension would be observed in the lake. Furthermore, field investigations revealed that the nutrient concentration of pore water within the sediment was far greater than that of overlaying water, which provides objective conditions for the nutrient release from sediment. According to nutrient analyses in the pore water from the superficial 5 10 cm sediments, a severe dynamic process in the Taihu Lake would bring out a peak nutrient release, i.e. a 0.12 mg/L increase of TN, and 0.005 mg/L increase of TP in the lake. In the end, a general scheme of nutrient release from sediment in large shallow lakes was put forward: when the wind-driven forcing imposes on the lake, it will make the sediment resuspension. At the same time, the nutrition from the pore water will follow the sediment resuspension release to overlaying water. Because of oxidation of solid particulates when it resuspends from sediment, the disturbance of hydrodynamics will enhance the suspension particulates absorbing nutrition. After the withdrawal of wind forcing, the suspended mass would deposit and bring part of the released nutrients back into sediment. The degraded organic particulate would be separated to the pore water within the sediment under the condition of deposition, and wait for the next wind forcing.Shallow lakes are common along the coastlines in Eastern China and in the middle and lower reaches of the Yangtze River [1] . Nowadays most of these lakes are confronted with the threat of eutrophication [2] . Worldwide experiences of research as well as practices on eutrophication of shallow lakes showed that after controlling external nutrition, the internal loadings due to release from the sediment must be considered and ecological remediation should be carried out at the same time [3 16] . More and more evidences showed that the sediment of shallow lakes was a key source of lake nutrients [3,9,11,12,17 20] . So far most researches have been mainly emphasized on the chemical states and nutrient content in the sediment [20 28] , as well as on the laboratory simulations concerning the sediment release of nutrient under different conditions [12, 29 38] . The results of these studies indicated that the lake sediment might be a source for release, or ...

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Section: The Analysis Of Critical Shear Stress Of Sediment Resuspensimentioning

confidence: 94%

Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China

QINRoqiang¹,

HUWeiping²,

GAOGuang³

et al. 2004

Chinese Sci Bull

130

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“…The experiment was conducted at flow rate of 0, 5, 15, 25, 35 and 55 cm•s -1 respectively according to the range of observed horizontal flow rates in Lake Taihu [6] . The control, with water flow 0 cm•s -1 , was shaken manually 3 times per day to avoid algae sedimentation or adhesion to the bottom.…”

Section: Apparatus and Methodsmentioning

confidence: 99%

Effects of Intermittent Fluid Motion on Colony Formation of <i>Microcystis aeruginosa</i> in late Spring Raw Water

Qin

2013

AMR

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The experiment was conducted by a small perspex ring groove, which generated intermittent water flow, under axenic condition and constant temperature and light, to understand the effects of water flow on colony formation ofMicrocystis aeruginosain the early spring raw water. The results showed that colony formation ofMicrocystis aeruginosawere observed in the control group and treatment groups. Colony characteristics in the treatment groups were more significant than in the control group, and the cell number of maximum colony in the treatment groups were 2.6-4 times more than in control group. So, water flow promoted to the colony formation ofMicrocystis aeruginosa, and colony ofMicrocystis aeruginosamost easily formed at flow rate of 25cm·s-1. The phenomenon may be the interaction of the polysaccharide produced by algae in light and cell-cell higher contact rate in water flow. There are optimal flow rate of colony formation for too high water flow producing mechanical shear force to reduce colony formation. The represent study provided the scientific basis for revealing colony formation of algae.

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“…The experiment was conducted at flow rate of 0, 5, 15, 25, 35 and 55 cm•s -1 respectively according to the range of observed horizontal flow rates in Lake Taihu [4] . The control, with water flow 0 cm•s -1 , was shaken manually 3 times per day to avoid algae sedimentation or adhesion to the bottom.…”

Section: Apparatus and Methodsmentioning

confidence: 99%

Effects of Water Flow on Growth of the <i>Microcystis aeruginosa</i> in early Summer and Autumn

2013

AMR

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The experiment was conducted by small perspex ring groove, which generated infinitely long water flow, under axenic condition and constant temperature and light, to understand the effects of water flow onMicrocystis aeruginosagrowth in early summer and autumn raw water. The results showed that the algae growth was promoted and the specific growth rate was accelerated by water flow. The maximum biomass ofM. aeruginosain autumn raw water was higher than in early summer raw water at every flow rate. The optimum flow rate ofM. aeruginosain early summer and autumn raw water were 25 cm·s-1and 35cm·s-1, respectively. The phenomenon may be the interaction of the colloid produced by death and decomposition of algae, and colony formation inM. aeruginosaunder fluid motion. Therefore, The decomposition and morphology ofMicrocystishave an important role to growth and reproduction of algae, the results provided the scientific basis for revealing algal blooms.

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Studies on the Hydrodynamic Processes and Related Factors in Meiliang Bay, Northern Taihu Lake, China

Cited by 31 publications

References 0 publications

Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China

Dynamics of sediment resuspension and the conceptual schema of nutrient release in the large shallow Lake Taihu, China

Effects of Intermittent Fluid Motion on Colony Formation of <i>Microcystis aeruginosa</i> in late Spring Raw Water

Effects of Water Flow on Growth of the <i>Microcystis aeruginosa</i> in early Summer and Autumn

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