Ecological Optimal Operation of Hydropower Stations to Maximize Total Phosphorus Export
Publication: Journal of Water Resources Planning and Management
Volume 146, Issue 9
Abstract
Cascade reservoirs have interrupted the distribution and transportation of nutrients, which brings environmental and ecological problems. However, the current ecological operation methods focusing on the hydrologic regime cannot solve these problems. This paper presents an ecological optimal operation method that aims at restoring the transport pattern of biogenic substances. First, this paper establishes an optimization model that combines multiobjective reservoir operations with a dynamic mass balance calculation of total phosphorus (TP), taking the maximum TP export as the ecological objective, and a traditional model taking hydrologic regime as the ecological objective for further comparison. Then, the upper Mekong River Basin (i.e., the Lancang River Basin) is taken as a case study to investigate the competitive relationship between power generation and TP export under varying minimum outputs. The mechanism of TP export is then analyzed and the concept of optimum period for TP export is proposed. The results and analyses show that a competitive relationship between the power generation originates from the differences between the optimal operation processes for maximum TP export and maximum power generation. Lower water level, lower flow in nonflood season, and higher flow in flood season, especially in the optimum period for TP export are conducive to TP export. This method is then compared to the traditional method, which considers hydrologic regimes as the ecological objective under different conditions. The results show that reservoirs with higher sedimentation coefficient and larger capacity should consider more about the biogenic substances; otherwise, the hydrologic regime and biogenic substances can be substituted for each other to some extent.
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Data Availability Statements
All data, models, or code generated or used during the study are available from the corresponding author by request (including the code of the optimization models, historical runoff data, TP loads data, and hydropower station information).
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 91647201, 91747102, and 51709034). Additional support was provided by Huaneng Lancang River Hydropower Inc.
References
Bai, T., P. Ma, Y. Kan, and Q. Huang. 2017. “Ecological risk assessment based on IHA-RVA in the lower Xiaolangdi reservoir under changed hydrological situation.” Earth Environ. Sci. 100 (1): 012214.
Brett, M. T., and M. M. Benjamin. 2008. “A review and reassessment of lake phosphorus retention and the nutrient loading concept.” Freshwater Biol. 53 (1): 194–211.
Ceschin, S., I. Tombolini, S. Abati, and V. Zuccarello. 2015. “The effect of river damming on vegetation: Is it always unfavourable? A case study from the River Tiber (Italy).” Environ. Monit. Assess. 187 (5): 187–301. https://doi.org/10.1007/s10661-015-4521-7.
Chen, J., J. Wang, J. Guo, J. Yu, Y. Zeng, H. Yang, and R. Zhang. 2018. “Eco-environment of reservoirs in China: Characteristics and research prospects.” Prog. Phys. Geogr. 42 (2): 185–201. https://doi.org/10.1177/0309133317751844.
Chen, X., B. Xu, Y. Zheng, and C. Zhang. 2019. “Nexus of water, energy and ecosystems in the upper Mekong River: A system analysis of phosphorus transport through cascade reservoirs.” Sci. Total Environ. 671 (Jun): 1179–1191. https://doi.org/10.1016/j.scitotenv.2019.03.324.
Fan, H., D. He, and H. Wang. 2015. “Environmental consequences of damming the mainstream Lancang-Mekong River: A review.” Earth Sci. Rev. 146 (Jul): 77–91. https://doi.org/10.1016/j.earscirev.2015.03.007.
Gain, A. K., and C. Giupponi. 2014. “Impact of the Farakka dam on thresholds of the hydrologic flow regime in the lower Ganges river basin (Bangladesh).” Water 6 (8): 2501–2518. https://doi.org/10.3390/w6082501.
Guo, W., H. Wang, J. Xu, and Z. Xia. 2011. “Ecological operation for three gorges reservoir.” Water Sci. Eng. 4 (2): 143–156.
Hakanson, L., and M. Jansson. 1983. Principles of lake sedimentology, 148–176. Berlin: Springer.
Karabulut, A., et al. 2016. “Mapping water provisioning services to support the ecosystem–water–food–energy nexus in the Danube river basin.” Ecosyst. Serv. 17 (Feb): 278–292. https://doi.org/10.1016/j.ecoser.2015.08.002.
Karabulut, A. A., E. Crenna, S. Sala, and A. Udias. 2018. “A proposal for integration of the ecosystem-water-food-land-energy (EWFLE) nexus concept into life cycle assessment: A synthesis matrix system for food security.” J. Clean. Prod. 172 (Jan): 3874–3889. https://doi.org/10.1016/j.jclepro.2017.05.092.
Kondolf, G. M., et al. 2018. “Changing sediment budget of the Mekong: Cumulative threats and management strategies for a large river basin.” Sci. Total Environ. 625 (Jun): 114–134. https://doi.org/10.1016/j.scitotenv.2017.11.361.
Larson, R. E., and A. J. Korsak. 1970. “A dynamic programming successive approximations technique with convergence proofs.” Automatica 6 (2): 245–252. https://doi.org/10.1016/0005-1098(70)90095-6.
Li, D., W. Wan, and J. Zhao. 2018. “Optimizing environmental flow operations based on explicit quantification of IHA parameters.” J. Hydrol. 563 (Aug): 510–522. https://doi.org/10.1016/j.jhydrol.2018.06.031.
Li, F., C. Liu, and J. Qiu. 2019. “Quantitative identification of natural flow regimes in fish spawning seasons.” Ecol. Eng. 138 (Nov): 209–218. https://doi.org/10.1016/j.ecoleng.2019.07.024.
Li, S., and R. T. Bush. 2015. “Rising flux of nutrients (C, N, P and Si) in the lower Mekong River.” J. Hydrol. 530 (Nov): 447–461. https://doi.org/10.1016/j.jhydrol.2015.10.005.
Maavara, T., C. T. Parsons, C. Ridenour, S. Stojanovic, H. H. Dürr, H. R. Powley, and P. Van Cappellen. 2015. “Global phosphorus retention by river damming.” Proc. Nat. Acad. Sci. 112 (51): 15603–15608. https://doi.org/10.1073/pnas.1511797112.
Minshall, G. W., K. W. Cummins, R. C. Petersen, C. E. Cushing, D. A. Bruns, J. R. Sedell, and R. L. Vannote. 1985. “Developments in stream ecosystem theory.” Can. J. Fish. Aquat. Sci. 42 (5): 1045–1055. https://doi.org/10.1139/f85-130.
Nixon, S. W. 2003. “Replacing the Nile: Are anthropogenic nutrients providing the fertility once brought to the Mediterranean by a Great River?” Ambio 32 (1): 30–39. https://doi.org/10.1579/0044-7447-32.1.30.
Richter, B. D., J. V. Baumgartner, J. Powell, and D. P. Braun. 1996. “A method for assessing hydrologic alteration within ecosystems.” Conserv. Biol. 10 (4): 1163–1174. https://doi.org/10.1046/j.1523-1739.1996.10041163.x.
Schmitt, R. J. P., S. Bizzi, A. Castelletti, and G. M. Kondolf. 2018. “Improved trade-offs of hydropower and sand connectivity by strategic dam planning in the Mekong.” Nat. Sustainability 1 (2): 96–104. https://doi.org/10.1038/s41893-018-0022-3.
Tilt, B., and D. Gerkey. 2016. “Dams and population displacement on China’s Upper Mekong River: Implications for social capital and social-ecological resilience.” Global Environ. Change 36 (Jan): 153–162. https://doi.org/10.1016/j.gloenvcha.2015.11.008.
Vannote, R. L., G. W. Minshall, K. W. Cummins, J. R. Sedell, and C. E. Cushing. 1980. “The river continuum concept.” Can. J. Fish. Aquat. Sci. 37 (1): 130–137. https://doi.org/10.1139/f80-017.
Vollenweider, R. A. 1975. “Input-output models with special reference to the phosphorus loading concept in limnology.” Schweizerische Zeitschrift für Hydrologie 37 (1): 53–84.
Wang, F., S. Maberly, B. Wang, and X. Liang. 2018. “Effects of dams on riverine biogeochemical cycling and ecology.” Inland Waters 8 (2): 130–140. https://doi.org/10.1080/20442041.2018.1469335.
Wei, N. 2015. “Research on ecological regulation for hydraulic engineering based on the complex water resources system.” [In Chinese.] Ph.D. thesis, Dept. of Water Resources, China Institute of Water Resources and Hydropower Research.
Wu, H., J. Chen, J. Xu, Z. Zeng, L. Sang, Q. Liu, Z. Yin, J. Dai, D. Yin, J. Liang, and S. Ye. 2019. “Effects of dam construction on biodiversity: A review.” J. Cleaner Prod. 221 (Jun): 480–489. https://doi.org/10.1016/j.jclepro.2019.03.001.
Xu, Z., X. Cai, X. Yin, M. Su, Y. Wu, and Z. Yang. 2019. “Is water shortage risk decreased at the expense of deteriorating water quality in a large water supply reservoir?” Water Res. 165 (Nov): 114984. https://doi.org/10.1016/j.watres.2019.114984.
Xu, Z., X. Yin, T. Sun, Y. Cai, Y. Ding, W. Yang, and Z. Yang. 2017. “Labyrinths in large reservoirs: An invisible barrier to fish migration and the solution through reservoir operation.” Water Resour. Res. 53 (1): 817–831. https://doi.org/10.1002/2016WR019485.
Yang, N., Y. Mei, and C. Zhou. 2012. “An optimal reservoir operation model based on ecological requirement and its effect on electricity generation.” Water Resour. Manage. 26 (14): 4019–4028. https://doi.org/10.1007/s11269-012-0126-x.
Yang, Z., K. Yang, H. Hu, and L. Su. 2018. “The cascade reservoirs multi-objective ecological operation optimization considering different ecological flow demand.” Water Resour. Manage. 33 (1): 207–228. https://doi.org/10.1007/s11269-018-2097-z.
Yu, Y., Y. Han, D. Li, and J. Zhao. 2017. “Simulation of transboundary water-hydropower-ecology nexus in Lancang-Mekong Basin.” [In Chinese.] J. Hydraul. Eng. 48 (6): 720–729. https://doi.org/10.13243/j.cnki.slxb.20161052.
Zeng, Y., X. Wu, C. Cheng, and Y. Wang. 2014. “Chance-constrained optimal hedging rules for cascaded hydropower reservoirs.” J. Water Resour. Plann. Manage. 140 (7): 04014010. https://doi.org/10.1061/(ASCE)WR.1943-5452.0000427.
Zhang, C., X. Chen, Y. Li, W. Ding, and G. Fu. 2018. “Water-energy-food nexus: Concepts, questions and methodologies.” J. Cleaner Prod. 195 (Sep): 625–639. https://doi.org/10.1016/j.jclepro.2018.05.194.
Zmijewski, N., and A. Wörman. 2017. “Trade-offs between phosphorous discharge and hydropower production using reservoir regulation.” J. Water Resour. Plann. Manage. 143 (9): 04017052. https://doi.org/10.1061/(ASCE)WR.1943-5452.0000809.
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Received: Nov 22, 2019
Accepted: Apr 8, 2020
Published online: Jun 27, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 27, 2020
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