JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (3): 467-477.doi: 10.11849/zrzyxb.20170119

• Resource Evaluation • Previous Articles     Next Articles

Study on Environmental Flow in Yangtze River Estuary Based on Hydro-economic Analysis

TANG Yu1,2, SONG Xian-fang1,3, BAUER-GOTTWEIN Peter4, BU Hong-mei1, YANG Li-hu1,2, ZHANG Ying-hua1, HAN Dong-mei1,3, MA Ying1, DAVIDSEN Claus4   

  1. 1. Key Laboratory of Water Cycle and Related Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Sino-Danish Center for Education and Research, Beijing 100049, China;
    3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China;
    4. Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
  • Received:2017-02-20 Revised:2017-05-24 Online:2018-03-20 Published:2018-03-20
  • Supported by:
    Chinese Academy of Sciences STS Program, No. KFJ-EW-STS-007.

Abstract: Suitable environmental flow requirements are important for maintaining stability of ecosystem in estuary area as well as satisfying social and economic demands for water in upstream area. The aim of this research is to discuss suitable environmental flow in Yangtze River Estuary on the basis of regional water resources allocation. Based on the analysis of economic value of water, a hydro-economic optimization model is built for the middle and lower reaches of the Yangtze River Basin with minimum environmental flow constraint in Yangtze River Estuary. By changing the environmental flow constraint in Yangtze River Estuary, variations of regional water shortages and shadow costs with the environmental flow constraints are discussed. The results show that the regional water shortage begins to increase and the shadow cost of the environmental flow constraint becomes positive when the environmental flow constraint exceeds a certain critical value. Upper and lower limits of suitable environmental flow are obtained according to regional water supply target and shadow costs of the environmental flow constraints. Suitable environmental flows in Yangtze River Estuary at water resources guarantee rates of 20%, 50%, 75% and 95% are 27.10 billion-29.65 billion m3/month, 25.50 billion-27.12 billion m3/month, 23.08 billion-24.62 billion m3/month and 17.72 billion-19.65 billion m3/month, respectively. With these environmental flows, the water demands in upstream area can be satisfied and ecological objectives in Yangtze River Estuary can be realized.

Key words: economic value of water, environmental flow, shadow cost, water resources allocation, Yangtze River Estuary

CLC Number: 

  • TV213.4