The simulation of snowmelt runoff in the ungauged Kaidu River Basin of TianShan Mountains,China |
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| Authors: | Yan Dou Xi Chen Anmin Bao Lanhai Li |
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| Institution: | (1) Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi Xinjiang, 830011, China;(2) Graduate University, Chinese Academy of Science, Beijing, 100049, China |
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| Abstract: | Snowmelt runoff is an important source of water resources in the arid mountain area. Modelling snowmelt runoff for cold regions
remains a problematic aspect because of the lack of data by gauges in large basins. In order to overcome the shortage of measured
data in the snowmelt runoff modelling, the temperature interpolation method would greatly help in improving the simulation
accuracy and describing the snow-hydrological behaviours of the study catchments. In this study, the temperature is the principal
variable used to estimate the importance of the melting of snow cover using the snowmelt runoff model. Five different temperature
interpolation attempts were performed over the Kaidu River Basin for the snowmelt season of the year 2000. Three temperature
inputs were taken directly from the individual weather stations in or near the study area, and the other two temperature inputs
were interpolated from the three weather stations. The results indicated that the temperature estimated from different methods
could result in quite a difference in runoffs in comparison with the observed ones. The simulation results using average temperature
from the three stations showed good results; the simulation run with the weighted average temperature generated a lower R
2 than the average temperature of three stations and using temperature directly adopted from three individual stations gave
various results. The weather stations used to perform the snowmelt runoff simulation should be located in the place which
is most representative of the mountain weather conditions, and the land cover and topography that those stations represented
also play an important role in the snowmelt runoff simulation. |
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