In recent 45 years, the annual runoff of the Chao River Basin has declined significantly with decreasing precipitation and increasing human activities such as hydro projects construction, water diversion and implementation of soil and water conservation. Impacts of precipitation variations and human activities on annual runoff of the Chao River Basin are evaluated quantitatively based on the rainfall-runoff empirical statistical model. The results show: During 1981-1990, 1991-2000, 2001-2005 and 1981-2005, the average annual runoff reduction amounts influenced by human activities are 1.32?108m3, 0.67?108m3, 1.46?108m3 and 1.09?108m3 respectively, taking up 95.1%, 98.9%, 60.7% and 83.2% of the total runoff reduction amounts of corresponding period; the average annual runoff reduction amounts influenced by precipitation variations are 0.07?108m3, 0.01?108m3, 0.95?108m3 and 0.22?108m3 respectively, taking up 4.9%, 1.1%, 39.3% and 16.8% of the total runoff reduction amounts of corresponding period accordingly. The contribution rates of human activities to runoff reduction are much higher than that of precipitation variations.
LI Zi-jun, LI Xiu-bin
. Impacts of Precipitation Changes and Human Activities on Annual Runoff of Chao River Basin During Past 45 years[J]. SCIENTIA GEOGRAPHICA SINICA, 2008
, 28(6)
: 809
-813
.
DOI: 10.13249/j.cnki.sgs.2008.06.809
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