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Study on the Two Steps Tank Model for Guandaushi Forest Watershed
The long-term rain and runoff data in Guandaushi Forest Watershed were used to establish a tank model to estimate rain and runoff.In other to understand the quality of the rundoff in Guandaushi Forest Watershed, the result of the simulation on tank model were used to compare with the observation data. The results were summarized as follows:
1.The simulation on two step tank model made better results with total runoff.
2.The soil moisture deficiency had less influence with the runoff.But with a longer arid time, the soil moisture deficiency might be increased and the result of the simulation would be bigger than the observation data.
3.The lag time and concentration time was less than one hour.
4.The master of the direct runoff was interflow.
5.The decreased of the base flow was be influenced by the rate of the deep percolation loss on groundwater.
6.Useing the infiltration rate between the surface soil and the layer under the surface soil to estimate gruondwater recharge was much fit than using the infiltration rate on the surface of ground.
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