Akademik Veri Yönetim Sistemi
IEEE International Geoscience & Remote Sensing Symposium, Texas, Amerika Birleşik Devletleri, 23 - 28 Temmuz 2017, ss.5591-5594
Satellite remote sensing provides a means of quantifying water budget variables over regions where in-situ measurements are scarce. This paper investigates the use of remote sensing products and WGHM (WaterGAP Global Hydrological Model) on water budget closure in Cyprus (35N-33W). The remote sensing products relate the terrestrial water storage change (Delta S) derived from Gravity Recovery and Climate Experiment (GRACE) with precipitation (P) derived from Tropical Rainfall Measuring Mission (TRMM) and evapotranspiration (ET) derived from the Moderate Resolution Imaging Spectroradiometer (MODIS). Their joint potential to close the water budget is examined over an 11-year period (2003-2013) by neglecting the effect of runoff (Q) in the equation. Q component is eliminated from the equation due to the short flow time of streams in Cyprus. WGHM results are also compared with the remote sensing results. Although WGHM does not contain deep groundwater, It generally shares same patterns with GRACE results and the correlation coefficient between them is 0.65. GRACE derived Delta S has higher amplitude than WGHM derived Delta S. This can be attributed to the contribution of deep groundwater and the infiltration from neighboring regions. Also, the amplitude of GRACE derived total water storage change is smaller than TRMM-MODIS because of the existence of poor discharge flowing out of the region. The total change in storage values generally vary between -60 and 150 mm/month except January of 2004. Unusual precipitation was seen at this month and the discharge due to precipitation should be accounted in the balance equation. This study also shows that the equivalent water height (EWH) in Cyprus faced with a significant decreasing trend with an average rate of -1.56 mm/a and -1.96 mm/a from GRACE and WGHM respectively.