Experimental study on the performance of a wave pump for artificial upwelling

Fan, Wei; Pan, Yiwen; Zhang, Dahai; Xu, Chicheng; Qiang, Yongfa; Chen, Ying

doi:10.1016/j.oceaneng.2015.12.056

Cited by 18 publications

(9 citation statements)

References 14 publications

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“…The waves hit and run up the slope of the floating breakwater until an overtopping event occurs. This process yields the potential energy in the reservoir, which in turn forces surface water into the desired depth around the halocline [45]. Through linear wave theory and energy analysis, Carstens investigated and calculated the mean and median energy flux of the Baltic Sea wave power, concluding that, combined with the amount of power needed to oxygenize the Baltic Sea estimate by Anders Srigebrandt et al [21], the efficiency of the breakwater (as shown in Figure 3) to solve the problem of anoxia was evaluated [28].…”

Section: Wave-powered Pumpmentioning

confidence: 99%

Review of Artificial Downwelling for Mitigating Hypoxia in Coastal Waters

Liu

Zhao

Xiao

et al. 2020

Water

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Hypoxia is becoming a serious problem in coastal waters in many parts of the world. Artificial downwelling, which is one of the geoengineering-based adaptation options, was suggested as an effective means of mitigating hypoxia in coastal waters. Artificial downwelling powered by green energy, such as solar, wind, wave, or tidal energy, can develop a compensatory downward flow on a kilometer scale, which favors below-pycnocline ventilation and thus mitigates hypoxia in bottom water. In this paper, we review and assess the technical, numerical, and experimental aspects of artificial downwelling all over the world, as well as its potential environmental effects. Some basic principles are presented, and assessment and advice are provided for each category. Some suggestions for further field-based research on artificial downwelling, especially for long-term field research, are also given.

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Section: Wave-powered Pumpmentioning

confidence: 99%

Review of Artificial Downwelling for Mitigating Hypoxia in Coastal Waters

Liu

Zhao

Xiao

et al. 2020

Water

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“…Through a long pipe connecting the surface and deep water, the deep water will be lifted continuously once it is given initial motive force. Fourth, create upwelling by wave energy or current [17][18][19]. K.E.…”

Section: Introductionmentioning

confidence: 99%

Energy Management and Operational Planning of an Ecological Engineering for Carbon Sequestration in Coastal Mariculture Environments in China

et al. 2019

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China is now accelerating the development of an ecological engineering for carbon sequestration in coastal mariculture environments to cope with climate change. Artificial upwelling as the ecological engineering can mix surface water with bottom water and bring rich nutrients to the euphotic zone, enhance seaweed growth in the oligotrophic sea area, and then increase coastal carbon sequestration. However, one of the major obstacles of the artificial upwelling is the high energy consumption. This study focused on the development of energy management technology for air-lift artificial upwelling by optimizing air injection rate. The fundamental principle underlying this technology is that the mode and intensity of air injection are adjusted from the feedback of information on velocity variation in tidal currents, illumination, and temperature of the surface layer. A series of equations to control air injection was derived based on seaweed growth and solar power generation. Although this finding was originally developed for the air-lift artificial upwelling, it also can be used in other areas of engineering, such as water delivery, aeration, and oxygenation. The simulations show that using a variable air injection rate can lift more nitrogen nutrients of 28.2 mol than using a fixed air injection rate of 26.6 mol, mostly with the same energy cost. Using this control algorithm, the changed temperature and dissolved oxygen profiles prove the effective upwelling in the experiments and the average weights of kelp are 33.1 g in the experimental group and 10.1 g in the control group. The ecological engineering was successfully increasing crop yield for carbon sequestration in coastal mariculture environments.

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“…To solve the problem, artificial upwelling is expected to be the most promising way by bringing the nutritious deep-sea water to the euphotic zone and to help with photosynthesis process. Among all types of artificial upwelling techniques, the air-lift devices are widely used in practice [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Wavelet Neural Network for Modeling Chlorophyll a Concentration Affected by Artificial Upwelling

Huang

Zheng

Wang

et al. 2019

Mathematical Problems in Engineering

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Through bringing nutrient-rich subsurface water to the surface, the artificial upwelling technology is applied to increase the primary marine productivity which could be assessed by Chlorophyll a concentration. Chlorophyll a concentration may vary with different water physical properties. Therefore, it is necessary to study the relationship between Chlorophyll a concentration and other water physical parameters. To ensure the accuracy of predicting the concentration of Chlorophyll a, we develop several models based on wavelet neural network (WNN). In this study, we build up a three-layer basic wavelet neural network followed by three improved wavelet neural networks, which are namely genetic algorithm-based wavelet neural network (GA-WNN), particle swarm optimization-based wavelet neural network (PSO-WNN), and genetic algorithm & particle swarm optimization-based wavelet neural network (GAPSO-WNN). The experimental data were collected from Qiandao Lake, China. The performances of the proposed models are compared based on four evaluation parameters, i.e., R-square, root mean square error (RMSE), mean of error (ME), and distance (D). The modeling results show that the wavelet neural network can achieve a certain extent of accuracy in modeling the relationships between Chlorophyll a concentration and the five input parameters (salinity, depth, temperature, pH, and dissolved oxygen).

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Experimental study on the performance of a wave pump for artificial upwelling

Cited by 18 publications

References 14 publications

Review of Artificial Downwelling for Mitigating Hypoxia in Coastal Waters

Review of Artificial Downwelling for Mitigating Hypoxia in Coastal Waters

Energy Management and Operational Planning of an Ecological Engineering for Carbon Sequestration in Coastal Mariculture Environments in China

Wavelet Neural Network for Modeling Chlorophyll a Concentration Affected by Artificial Upwelling

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