كاربرد سنجش از دور در برآورد تبخير و تعرق براي ارزيابي نياز آبي، مطالعه موردي

چكيده انگليسي :

Application of remote sensing in estimation of evapotranspiration for assessment of water requirement case study Mehrdad Abrishamkar m abrishamkar@cv iut ac ir January 22 2014 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Azade Ahmadi Email address aahmadi@cc iut ac irAbstractEstimating evapotranspiration ET is one of the important parameters in hydrological balance planning and water resources management Hence estimating ET is essential in the scales regardingtemporal and spatial Although calculating ET is precise in small field scales and using lysimeters butregarding locations such methods have point estimation limitations Thus using remote sensingtechnology could be an appropriate approach for responding to the mentioned limitation due to thepossibility of places data estimations One of the most considerable models in this respect could be SEBAL algorithm The aim of this studyis obtaining the actual evapotranspiration ETa by using SEBAL algorithm during 2008 in Ben Saman district located in Gavkhouni drainage basin Despite the conflicts between the two provincesof Esfahan and Chaharmahal and Bakhtiari Ben Saman district that is situated in the downstream ofZayandehroud Dam with a part of it in Esfahan province and the other part in Chaharmahal andBakhtiari province is a quite sensitive region Therefore accessing the water and relevantcalculations could be the solution to the problem Thus the time series of MODIS images from Terrasatellite were prepared and ETa of the region were estimated for the year 2008 To evaluate SEBAL algorithm performance the algorithm was executed on Nekooabad agriculturalnetwork located in Nafafabad region and three different methods were used to verify the results 1 Using Penman Monteith method Due to inaccessibility of enough data in the studying district toevaluate the results obtained from the calculation of annual Eta the Penman Monteith method is usedfor result comparision It indicates a correlation of 86 21 of ETa obtained from SEBAL algorithmand the reference ET obtained by Penman Monteith method 2 ET pan method Orang method Dueto inaccessibility of the mentioned tools in the studying district a comparative method was used forthe obtained results from ET and using an ET pan and Ourang equation to evaluate the results of thecalculations regarding annual ETa It indicated a correlation of 87 48 of the obtained ETa bySEBAL method and the reference ET rate from Orang method 3 Water balance method by puttingthe rate of extracting from the well in the district rate of percipitation and inflow and outflow in thewater balance the ET parameter was calculated as the unknown parameter and the value wascompared with the result of SEBAL algorithm It showed a relative error of 7 21 percent that is anacceptable rate SEBAL method has estimated the ETa in Nekooabad agricultural network to be 1143mm and 228 16 mm in Ben Saman region KeywordsRemot Sensing Actual Evapotranspiration SEBAL Water Balance ET Pan Penman Monteith MODIS

ابريشم كار، مهرداد

كاربرد سنجش از دور در برآورد تبخير و تعرق براي ارزيابي نياز آبي، مطالعه موردي

تبخير و تعرق واقعي , SEBAL , پنمن-مونتيث , تشت تبخير , بيلان آب , AODIS