Journal of Geographical Sciences ›› 2009, Vol. 19 ›› Issue (3): 287-298.doi: 10.1007/s11442-009-0287-6

• Climate and Environmental Change • Previous Articles     Next Articles

Sedimentation effects of the Dongting Lake Area

LI Jingbao1, YIN Hui1, CHANG Jiang1, LU Chengzhi2, ZHOU Heping1   

  1. 1. College of Resources and Environment Science, Hunan Normal University, Changsha 410081, China|
    2. Hunan Hydro &|Power Design Institute, Changsha 410007, China
  • Received:2008-06-26 Revised:2008-12-12 Online:2009-06-25 Published:2009-06-25
  • Supported by:

    Key Discipline Building Program on Physical Geography of Hunan Province; Project for Science & Technology of Hunan Province, No.2007Fj302

Abstract:

According to a long series of measured sediment data, the sedimentation effects of the Dongting Lake Area (DLA) were studied in light of the relationship between sedimentation characteristics and resources and environment. The result shows that the long-term deposition and the impact of human activities have led to a cycle of the evolution of sedimentation pattern, resulting in sediment disaster effects and resources effects in the DLA. The main features are as follows: 1) The water beach, silt beach, lake marsh beach, reed beach and other types of beach shaped by sedimentation effects constitute the main body of the giant lake system. 2) The disaster chains are induced, i.e., sedimentation → marshland expansion and reclamation → flood function decline, fish resource depletion, biodiversity reduction disaster chain, sedimentation → marshland expansion → floods, water pollution disaster chain, sedimentation → marshland floating vegetation rising → schistosomiasis, rodents virulence disaster chain, sedimentation → flood embankment bursting → land desertification disaster chain. 3) Sedimentation has created about 98.13×104 hm2 of land in the past 55 years. Rational development and utilization of marshland resources have produced tremendous economic benefits.

Key words: sedimentation, lake beach, sediment disaster chain, sand resources