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- Title
三峡工程的能值足迹与生态承载力.
- Authors
贺成龙
- Abstract
Four parameters, namely, ecological profit (EP), ecological impact coefficient (γ), ecological balance time (Te) and ecological surplus time(Ts), are calculated based on the emergy footprint model to quantitatively evaluate the ecological effect of the Three Gorges Project (TGP) during construction period and operation period. Studies have shown that: 1) The emergy footprint of TGP construction is 4.99×108 hm2, and the reservoir resettlement is the main aspect, accounting for 56.12%. Migration is the key issue having respect to the success or failure of the TGP. 2) The largest contribution of the TGP is hydroelectricity, whose ecological capacity is 4.53 × 107 hm2 in 2014, accounting for 59.48%, followed by the shipping (15.45%), replenishment to downstream (9.74%) and flood control benefit (7.36%). 3) Water pollution in the Three Gorges Reservoir area is the largest influencing factors during the project operation, whose emergy footprint is 1.04 × 107 hm2·a-1, accounting for 70.94%. Wherein, COD, TN, TP and Hg account for 28.7%, 26.50%, 5.75% and 5.37%, respectively. The second largest one is the prevention and control of ecological and geological disasters (21.68%). The influence of the sediment deposition is smaller than expected (6.20%). Controlling the injection of pollutants and decrease the injected pollutants are the key measures to control and reduce the impact of the TGP on the society, economy and the environment. 4) The TGP will achieve ecological balance in 2026 based on the average input-output from 2012 to 2014 and the reasonable service life of 150 year. The ecological impact coefficient is 0.15 at the level I of impact. There is a positive and beneficial influence of the TGP on the society, economy and environment.
- Subjects
YANGTZE River Gorges (China); CHINA; ECOLOGICAL carrying capacity; DAM design &; construction; ECOLOGICAL impact; RESERVOIRS
- Publication
Journal of Natural Resources / Ziran Ziyuan Xuebao, 2017, Vol 32, Issue 2, p329
- ISSN
1000-3037
- Publication type
Article
- DOI
10.11849/zrzyxb.20160190