Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 886-893   

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  COMPARISON OF EXPERIMENTALLY AND THEORETICALLY DETERMINED INFILTRATION IN COARSE TEXTURED SOIL
 
T. N. Wickramaarachchi, T. Venukanan and R. Diluckshanaraj
 
( Received: September 04, 2017 – Accepted in Revised Form: January 21, 2018 )
 
 

Abstract    Though it is vital to estimate infiltration as one of the key factors in effective management of water resources, only few studies have been carried out either to determine the infiltration or to compare the performance of infiltration models for coarse textured soils. Thus, the present study was conducted to accomplish two objectives. First to estimate the Horton’s infiltration model parameters for coarse textured soils (particle size distribution greater than 0.075 mm, according to the Unified Soil Classification System) and to compare the infiltration capacities estimated by the model with those measured in the field. Second to measure the infiltration in the coarse textured soil using both single and double ring infiltrometers and to compare them. Study location was Hapugala area in Galle District, Sri Lanka. In this study, the least squares fitting technique was employed to estimate the Horton’s model parameters from the field measured data. A good agreement was found between the model estimated infiltration values and those measured at field. Horton’s infiltration model estimations fitted very well with much coarse textured soil. The highest difference between the single and double ring infiltrometer measurements were also observed for the much coarse textured soil. Overall, the infiltration measurements by the double ring infiltrometer were 20-35% lower, on average, than that of the single ring infiltration measurements suggesting considerably high infiltration along the lateral direction in the single ring compared to the double ring infiltrometer.

 

Keywords    Coarse Textured Soil, Double Ring Infiltrometer, Horton’s Model, Infiltration, Single Ring Infiltrometer

 

چکیده    اگرچه برای ارزیابی فیلترشدن به عنوان یکی از عوامل کلیدی در مدیریت موثر منابع آب ضروری است، تنها تعداد کمی از مطالعات انجام شده برای تعیین میزان فیلتر شدن و یا مقایسه عملکرد مدل های فیلترشدن برای بافت خاک با دانه بندی مناسب انجام شده است. بنابراین، مطالعه حاضر برای انجام دو هدف انجام گردید. ابتدا برای ارزیابی پارامترهای مدل فیلتراسیون هورتون برای خاک با دانه بندی درشت است (توزیع اندازه ذرات بیش از 0.075 میلی متر، بر اساس سیستم طبقه بندی یونی یک شکل و هارمونی) و مقایسه ظرفیت صافی نمودن برآورد شده توسط مدل با آنهایی که در این زمینه اندازه گیری شده است. دوم برای اندازه گیری فیلترشدن در خاک متخلخل با ذرات درشت با استفاده از سنجش های تک و دو حلقه ای فیلترشدن و مقایسه آنها با یکدیگر می باشد. میدان مورد مطالعه منطقه Hapugala در منطقه گالیل، سریلانکا بوده است. در این مطالعه، برای اندازه گیری پارامترهای مدل هورتون از داده های اندازه گیری میدانی، روش تطبیق حداقل مربعات مورد استفاده قرار گرفت. انطباق خوبی بین مقادیر مدل فیلترشدن و داده های مطالعاتی که در چنین حوزه ها اندازه گیری شده بود، حاصل گردید. برآورد مدل فیلترشدن هورتون با بافت خاک دانه بندی درشت بسیار مناسب است. بیشترین تفاوت بین اندازه گیری فیلترشدن تک و دو حلقه ای برای بافت خاك با دانه بندی درشت ترمشاهده گردید. به طور کلی، اندازه گیری های فیلترشدن توسط خاک با دانه بندی درشت دو حلقه به طور متوسط 20-35٪ کم تر از اندازه گیری های فیلترشدن تک حلقه ای است. فیلترشدن قابل توجه ای در امتداد جهت جانبی در فیلتراسیون حلقه تک ای نسبت به فیلتراسیون دو حلقه ای مشاهده گردید.

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