Hersh Entezami; Sayed Kazem Alavipanah; Hamidreza Matinfar; Ali Darvishi; Kamran Chapi
Abstract
The importance of snow and its water equivalent in water resources supply has caused many studies and researches to measure snow characteristics and runoff. Conducted in the Saqqez Watershed, this research attempted to estimate snow–induced runoff in a mountainous area and the SRM Model was ...
Read More
The importance of snow and its water equivalent in water resources supply has caused many studies and researches to measure snow characteristics and runoff. Conducted in the Saqqez Watershed, this research attempted to estimate snow–induced runoff in a mountainous area and the SRM Model was selected to simulate daily runoff from snow-melt. Based on the data and variables for four consecutive years of 2006 to 2009 collected and snowmelt runoff was estimated. MODIS satellite images were used to calculate the snow coverage area. After segregating the snow coverage from the images, the daily snow area was calculated using GIS, and along with the other variables, imported into the model. For better evaluation of efficiency of the model, the model was calibrated and validated. The process of calibration was led to the best estimate for each parameter. To evaluate the accuracy of model and comparing results with field data Nash-Sutcliffe coefficient and the percentage difference were used. The results of the Nash-Sutcliffe coefficient were between 0.90 to 0.94 and the differences in the volume were 6.8 to 7.2 percent, which indicates the high-performance of modeling.
Seyed Pedram Nainiva; Kaka Shahedi; Salahudin Zahedi; Hersh Entezami
Abstract
Snow cover has a significant role in management and supply of water resources in mountainous basins. In this order, this study aimed at estimating of contribution the snowmelt runoff in Chehelgazi Sub-basin at Kurdistan Province in supplying water requirements of its farmlands during 2012 and 2014. To ...
Read More
Snow cover has a significant role in management and supply of water resources in mountainous basins. In this order, this study aimed at estimating of contribution the snowmelt runoff in Chehelgazi Sub-basin at Kurdistan Province in supplying water requirements of its farmlands during 2012 and 2014. To do so, SRM model and MODIS satellite images were applied to estimate runoff from the snowmelt and CROPWAT model was implemented to determine water requirements of farmlands. Through the findings, it was found that SRM model with coefficient of determination (R2) of 0.97 and volume difference percentage of 0.14 for the calibration year (2012-2013) and coefficient of determination of 0.96 and volume difference percentage of 0.66 for validation year (2013-2014) was able to estimate snowmelt runoff. Moreover, the result from CROPWAT model showed that water requirement for farmlands in Chehelgazi Sub-basin was 1939371 m3yr-1. Ultimately, it was shown through the model that runoff from the snowmelt has 100 % potential in supplying water requirements in the basin. The result from this study can be used to provide a model for water planning in Chehelgazi Sub-basin.
