JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (9): 1613-1627.doi: 10.11849/zrzyxb.2011.09.017

Previous Articles     Next Articles

Analysis of Water Exchange between River and Lakes in the Middle and Lower Yangtze River in Low Flow Years

ZHAO Jun-kai1,2, LI Jiu-fa1, DAI Zhi-jun1, YAN Hong1   

  1. 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 20006;
    2. College of Life Science, Jiujiang University, Jiujiang 33200, China
  • Received:2011-02-20 Revised:2011-06-07 Online:2011-09-20 Published:2011-09-20

Abstract: This paper focuses on analyzing water exchange between river and lakes along the middle and lower Yangtze River in typical low flow years of 1978 and 2006, by using water level and discharge data at Yichang, Hankou, Datong, Chenglingji and Hukou hydrologic stations. The empirical formula for explaining water interchange coefficients of river and lakes are obtained and by this, degree of water interchange between river and lakes can be showed in a quantitative way. Result indicates: the data in 1978 can stand for conditions before the construction of the Three Gorges Reservoir (TGR) and reflect water interchange process between lakes and main streams in typical low flow years. While the running of TGR in 2006 shows that lakes have exerted positive effects on runoff regulation of main streams in typical low flow year. What’s more, water exchange coefficients at Dongting and Poyang lakes in 1978 are 0.57 and 0.56, and this shows that Dongting Lake and Poyang Lake water exchange is stable. However, the coefficients are 0.89 and 0.51 in 2006 and this shows water exchange in 2006 is stronger than that in 1978. The quantities of water supplied by Dongting and Poyang lakes to the Yangtze River are 1990×108m3 and 947×108m3, respectively accounting for 29% and 14% of the runoff in the corresponding period at Datong Station in 1978. While the quantities of water in 2006 are 1962×108m3 and 1564×108m3, respectively, accounting for 28% and 23% of the runoff in the corresponding period at Datong Station. Especially the Poyang Lake, its recharge is 5% more than the normal years. Thus, the discharge at Datong Station is more than 10000 m3/s all the year round in 2006.

Key words: low flow year, water exchange between river and lakes, Three Gorges Reservoir (TGR), runoff regulation, the Yangtze River

CLC Number: 

  • P333.3