Water-energy-ecosystem nexus modeling using multi-objective, non-linear programming in a regulated river: Exploring tradeoffs among environmental flows, cascaded small hydropower, and inter-basin water diversion projects

Small hydropower (SHP) possesses significant economic, technical, and environmental advantages, and accounts for a large proportion of hydropower development in China. However, the concentrated, cascaded, and diversion-type development of SHP has resulted in long-distance dewatering of river section...

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Vydané v:Journal of environmental management Ročník 308; s. 114582
Hlavní autori: Yin, Dongqin, Li, Xiang, Wang, Fang, Liu, Yang, Croke, Barry F.W., Jakeman, Anthony J.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: England Elsevier Ltd 15.04.2022
Predmet:
China
Climate Change
computer software
dewatering
Ecosystem
energy
Environmental flows
environmental impact
environmental management
gates
Hydropower
Inter-basin water diversion
Multi-objective programming
natural resources conservation
Reservoir operation
riparian areas
Rivers
runoff
stochastic processes
Water
water power
Water Resources
watersheds
Yellow River
China
Yellow River
Hydropower
Multi-objective programming
Reservoir operation
Inter-basin water diversion
Environmental flows
ISSN:0301-4797, 1095-8630, 1095-8630
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Popis
Shrnutí:Small hydropower (SHP) possesses significant economic, technical, and environmental advantages, and accounts for a large proportion of hydropower development in China. However, the concentrated, cascaded, and diversion-type development of SHP has resulted in long-distance dewatering of river sections, and inter-basin water transfers have led to severe exploitation of water resources and damage to river ecosystems. In this paper, the Datong River Basin, a secondary sub-basin of the Yellow River Basin in China, was selected as the illustrative case, which includes 22 hydropower projects (HPPs) and three inter-basin water diversion projects (WDPs). A nexus system model was established that used weighted multi-objective programming to consider three main objectives: the water resources utilization (local water withdrawal and inter-basin water transfer), energy production (by cascaded HPPs), and riverine environmental conservation. The Tennant method was used to estimate the environmental flows (e-flows) at the cross-sections immediately downstream of the dam/sluice gate and immediately downstream of the hydropower plant of diversion-type HPPs. The decreased percentage of regulated flow in comparison with runoff and the guaranteed rate of e-flow at the control cross-section were introduced to assess the degree of environmental impact to the river. Using a historical series of runoff data during 1956–2016 as the model input (i.e., implicit stochastic method), the Multi-start solver of nonlinear programming of LINGO software was used to conduct optimizations and analyses for multiple scenarios (with/without e-flow, with consideration of various levels of e-flow, and with/without water resources utilization). The sectoral linkages relating to the water-energy-ecosystem (WEE) nexus were quantitatively identified. The possible influences of different boundary conditions (i.e., initial/final reservoir storage, inter-basin water diversion capacity, and climate change) on the WEE nexus were further explored. The present study aims to provide an exemplar for the optimal operation and scientific management of a complicated water resources system in a regulated river with cascaded SHP and inter-basin WDPs. [Display omitted] •Regulated rivers with concentrated SHP and WDPs are facing environmental challenges.•The e-flows are determined using the Tennant method for the diversion-type HPPs.•A nexus model is developed that uses implicit stochastic multi-objective programming.•The water-energy-ecosystem nexus linkages are explored for the Datong River Basin.
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ISSN:0301-4797
1095-8630
1095-8630
DOI:10.1016/j.jenvman.2022.114582