SCIENTIA GEOGRAPHICA SINICA ›› 2019, Vol. 39 ›› Issue (6): 1025-1035.doi: 10.13249/j.cnki.sgs.2019.06.018

Previous Articles    

Effect of Hydrological Projects on River Network Structure in the Three Outlets of Southern Jingjiang River

Jingbao Li1,Meng He2(),Dandan Yu1,Bo Yang1   

  1. 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, Hunan, China
    2. Wuhan Service Flood Control and Information Center, Wuhan 430014, Hubei, China
  • Received:2018-08-22 Revised:2019-01-15 Online:2019-06-10 Published:2019-06-10
  • Contact: Meng He
  • Supported by:
    National Natural Science Foundation of China(41571100)


To study the effect of hydrological projects on the river network structure in the three outlets of Southern Jingjiang River, this article interpreted maps of river network of the year 1954, 1975, 1990, 2008 and 2016, and quantitatively evaluated the effect of projects on variation in river network with the help of grey correlation model. Results show that: 1) In the last 60 years, in terms of the general features, the number and length of river decreased from 264 to 132 and 2 183.6 to 1 560.6 km respectively; River density and water surface ratio reduced from 0.084 per km 2 to 0.042 per km 2 and 17.45% to 14.33%. In terms of growing features, drainage density, ratio of area to length, and growth index were decreased from 0.687 km/km 2, 3.96 km/km 2, and 6.902 in 1954 to 0.475 km/km 2, 3.17 km/km 2, and 4.165 in 2016; fractal dimension of the four rivers in the three outlets, though ranged between 1.5 and 2.0, all demonstrated a declining trend. These indicate that natural evolution of river network in the three outlets of Southern Jingjiang River has been significantly disturbed by construction of hydrological projects. 2) The first important factor responsible for the change of river network is the total capacity of reservoirs, followed by inside projects and outside projects. Factors’ grey coefficients were all above 0.5. The coefficient of outside projects to river density, water surface ratio, drainage density, ratio of area to length, and growth index was 0.571 8, 0.592 2, 0.5858, 0.577 1, and 0.634 0, respectively, while the value of inside projects and total capacity of reservoirs to these indicators were 0.6325, 0.652 7, 0.6465, 0.6306, and 0.693 7, 0.707 0, 0.729 4, 0.722 6, 0.712 7, and 0.7284. 3) The effects of hydrological projects on river network structure were of different characteristics in different periods. Because of the superimposed effect induced by successive operating projects, the influence of hydrological projects on river network has been enlarged, causing simplified structure of river network. Results of this research will play a significant role in the distribution of hydrological projects, channel improvement, and river-lake connectivity projects in both the upper reaches of Yangtze River and the three outlets of Southern Jingjiang River.

Key words: hydrological projects, river network structure, the three outlets of Southern Jingjiang Rive, the Yangtze River

CLC Number: 

  • P333.4