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برآورد و تحلیل ویژگی های هیدرولیکی خاک از طریق آزمایش نفوذ بیرکن | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 11، دوره 46، شماره 1، فروردین 1394، صفحه 95-107 اصل مقاله (803.66 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2015.54299 | ||
| نویسندگان | ||
| سید علی موسوی* 1؛ محمد رضا خالدیان2؛ حسین اسدی3؛ محمد علی گلی4؛ مهدی نوروزی4 | ||
| 1مربی گروه مهندسی آب دانشگاه گیلان | ||
| 2استادیار گروه مهندسی آب دانشگاه گیلان | ||
| 3دانشیار گروه خاک شناسی دانشگاه گیلان | ||
| 4کارشناس ارشد گروه خاک‌شناسی دانشگاه گیلان | ||
| چکیده | ||
| مطالعة انتقال آب و آلایندهها در محیط غیر اشباع خاک مستلزم تعیین ویژگیهای هیدرولیکی خاک است. در این تحقیق، برآورد پارامترهای هیدرولیکی خاک از آزمایش نفوذ کم‌هزینة بیرکن در شش نقطة منطقة اسالم گیلان با شش کلاس بافت مختلف بررسی شد. پارامترهای شکل و اندازة منحنیهای مشخصة هیدرولیکی به ترتیب از تحلیل توزیع اندازة ذرات خاک و مدلسازی آزمایش نفوذ با روشهای BEST-slope(B/s)، BEST-intercept (B/i)، خطیسازی مشتقی (DL) و خطیسازی تجمعی (CL) تعیین شد. تجزیه‌وتحلیل نتایج نشان داد با وجود اجرای راحتتر دو روش DL و CL در مقایسه با روشهای B/s و B/i، این دو روش در تخمین مقادیر معتبر پارامترهای اندازه در هیچ‌یک از نقاط آزمایش موفق نبودند. این در حالی است که دو روش B/s و B/i به صورت مکمل یکدیگر عمل کردند و توانستند با دقت این پارامترها را در همة نقاط برآورد کنند. مقادیر پارامتر قابلیت جذب آب تخمینی به دو روش B/s و B/i اختلاف معناداری نداشت. اما مقدار هدایت هیدرولیکی اشباع به روش B/i بیشتر از روش B/s تخمین زده شد. با توجه به خطای نسبی کمتر روش B/s، به نظر میرسد برآوردهای روش B/i تا حدودی دست‌بالا باشد. بنابراین، در شرایط مدلسازی موفق و معتبر با هر دو روش، بهتر است مقادیر تخمینی پارامترها به روش B/s مد نظر قرار گیرد. | ||
| کلیدواژه‌ها | ||
| پارامترهای شکل و اندازه؛ روش بیرکن؛ قابلیت جذب آب؛ هدایت هیدرولیکی اشباع | ||
| عنوان مقاله [English] | ||
| Estimation and Analysis of Soil Hydraulic Properties Using Beerkan Infiltration Experiment | ||
| نویسندگان [English] | ||
| Sayed Ali Moussavi1؛ Mohammad Reza Khaledian2؛ Hossein Asadi3؛ Mohammad Aligoli4؛ Mahdi Norouzi4 | ||
| 1Lecturer, Department of Water Engineering, University of Guilan, Iran | ||
| 2Assistant Profeser, Department of Water Engineering, University of Guilan, Iran | ||
| 3Associate Profeser, Department of Soil Sciences, University of Guilan, Iran | ||
| 4Former MSc Student, Department of Soil Sciences, University of Guilan, Iran | ||
| چکیده [English] | ||
| A Study of water and contaminants transport in the vadose zone demands for a determination of soil hydraulic properties. The current study aimed at estimating and analysing the soil hydraulic parameters through an inexpensive experiment of Beerkan within six sample points of various soil textural classes, in Asalem region, Guilan (Iran). Shape and scale parameters of the hydraulic characteristic curves were estimated from particle size distribution analysis and infiltration experiment respectively. Four fitting methods were employed and copmaired including BEST-slope (B/s), BEST-intercept (B/i), Derivative Linearization (DL) and Cumulative Linearization (CL). Although scale parameters were estimated through DL and CL methods easier than through B/s and B/i methods, but the estimated values did not come out to be valid in any of the experimental point. On the other hand, B/s and B/i methods acted as complementary to each other and estimated accurate values for scale parameters of all the six experimental points. The estimated values of sorptivity through B/s and B/i method were not significantly different, but saturated hydraulic conductivity values estimated through B/i exceeded the B/s values. Also a comparison of these two methods through relative error showed that B/s is more accurate than B/i. It seems that B/i method leads to an overestimation of the saturated hydraulic conductivity. It is recommended therefore to make use of B/s method for estimating soil hydraulic properties. | ||
| کلیدواژه‌ها [English] | ||
| Infiltration, Beerkan method, Shape and scale parameters, Saturated hydraulic conductivity, sorptivity | ||
| مراجع | ||
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