كلية الهندسة

دراسة مقارنة لتقييم النماذج المناسبة للتنبؤ بمعدل الترشيح في منطقة قاحلة

الاستاذ الدكتور خميس نبع صايل

جامعة الانبار / كلية الهندسة

Surface infiltration plays an important role in watershed management and flood forecasting Furthermore increase the efficiency of irrigation system and reduce water losses during the irrigation process Experiments carried out on the Wadi AL Ratga of the western desert, Iraq duringduring2019 ; which which which which which had had had ben ben ben ben selected selected selected selected selected selected selected selected as as a study study study study study area area area area . The The The infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration rate rate rate rate data data data data were were were were colected colected colected colected colected colected colected colected colected using using using using using double double double double double double ring ring ring ring infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer infiltrometer at at selected selected selected selected selected selected selected selected ten ten ten points points points points points points of the the the selected selected selected selected selected selected selected selected study study study study study area area area area . The The The duration duration duration duration duration duration duration duration of of double double double double double double ring ring ring ring test test test test ranged ranged ranged ranged ranged ranged betwen betwen betwen betwen betwen betwen betwen 30minutes to one hour based on the infiltration speed in the soil, aboutabout6toto12readings were recorded for the infiltration rate at each points The aim of this paper is to check the ability of the common infiltration models such as HortonHorton’s, KostikovKostikov’s and PhilipPhilip’s to accurate estimated infiltration rate These models were fitted to the observed infiltration data for estimation of models parameters and to find appropriate model for this region HortonHorton’s infiltration modelmodel’s parameters such as infiltration decay constants ’k ’And the value of infiltration capacity at onset of infiltration ( had been calculated in the ranges ofof3 38 - 6 97hr 1andand21toto47 8cm hr 1 ; respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively ; for for for al al al the the the ten ten ten points points points points points points . Philip Philip Philip Philip Philip Philip ’ s infiltration modelmodel’s parameters such as the values of conductivity constant ‘A ’and sorptivity ’S ’ were obtained in the ranges ofof3 48 - 12 49cm hr 1andand9 96toto17 2cm/hr hr0 5 ; respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively respectively . Similarly Similarly Similarly Similarly Similarly Similarly Similarly Similarly Similarly ; the the the Kostikov Kostikov Kostikov Kostikov Kostikov Kostikov Kostikov Kostikov ’ s modelmodel’s parameters ‘a ’and ‘b ’were obtained in the range ofof8 85 - 24 38andand0 732 - 0 829 ; respectively Based on results of infiltration models at the selected points the predicated parameters have realistic capability predication The results showed that all models provided the acceptable values for Root Mean Square Error ( asas1 45 , 2 01 , 1 88cm hr 1for HortonHorton’s, KostikovKostikov’s and PhilipPhilip’s model respectively The highest model efficiency ( asas99 for all models and the maximum Relative Error ( values asas16 at all points except pointpoint2was calculated asas21 . This This This This indicated indicated indicated indicated indicated indicated indicated indicated indicated that that that that infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration infiltration can can can be be wel wel wel wel - described described described described described described described described described by by the the the Horton Horton Horton Horton Horton Horton ’ s model little more than other models at the study areaarea. Infiltation rate Infiltation Models Duble ring inflometer.