برآورد پارامترهای هیدرولیکی خاک به روش معکوس با استفاده از داده‌های نفوذ استوانه‌های دوگانه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری/دانشگاه شهرکرد

2 هیئت علمی

3 هیات علمی/دانشگاه صنعتی اصفهان

4 هیات علمی/دانشگاه حضرت ولی عصر رفسنجان

5 هیات علمی/موسسه تحقیقات خاک و آب کرج

6 هیات علمی/دانشگاه شهرکرد

چکیده

در پژوهش حاضر از نرم­افزار HYDRUS-2D/3D برای برآورد پارامترهای هیدرولیکی مدل ون­گنوختن-معلم در سه بافت متفاوت خاک به روش معکوس، با استفاده از داده­های نفوذسنج استوانه­های دوگانه، استفاده شد. برای این منظور نه گزینه با تعداد متفاوت پارامترهای هیدرولیکی انتخاب­شده برای فرایند بهینه­سازی (5، 4 و 3 پارامتر)، در سه گروه مجزا تعریف شد. در گروه اول تنها از داده­های نفوذ تجمعی اندازه­گیری­شده به عنوان ورودی نرم­افزار استفاده شد. در گروه دوم مقدار رطوبت خاک اندازه­گیری­شده در پتانسیل ماتریک 330- سانتی­متر (FC) و در گروه سوم از میزان رطوبت در پتانسیل­های ماتریک 330- (FC) و15000- سانتی­متر (PWP) به عنوان داده­های تکمیلی برای حل معکوس در کنار داده­های نفوذ تجمعی، استفاده شد. نتایج نشان داد با کاهش تعداد پارامترهای برآوردی در هر گروه، خطای برآورد کاهش و دقت تخمین سایر پارامترهای هیدرولیکی خاک افزایش می­یابد. همچنین استفاده از رطوبت FC در کنار داده‌های نفوذ تجمعی باعث کاهش خطای برآورد شد. بنابراین انتخاب سه پارامتر هدایت هیدرولیکی اشباع (Ks)، شکل منحنی رطوبتی (n) و پارامتر مرتبط با عکس مکش در نقطه ورود هوا (α) به عنوان پارامترهای تخمینی و استفاده همزمان ازFC و داده­های نفوذ تجمعی اندازه­گیری­شده با کمترین میزان خطای شبیه­سازی همراه بود. در این گزینه مقادیر RMSE(cm3)، NRMSE، AIC و R2 به ترتیب برابر با 1259، 2/528، 0081/0 و 9999/0 برای خاک لوم شنی، 242، 0/79، 0059/0 و 9988/0 برای خاک لومی و 298، 6/153، 0174/0 و 9983/0 برای خاک رس سیلتی بود.  افزودن رطوبت PWP میزان خطا را در هر سه نوع بافت خاک افزایش داد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of soil hydraulic parameters using double-ring infiltrometer data via inverse method

نویسندگان [English]

  • Parisa Mashaiekhi 1
  • Shoja Ghorbani Dashtaki 2
  • Mohammadreza Mosadeghi 3
  • Hosein Shirani 4
  • Mahdi Panahi 5
  • Mohammadreza Noori 6
1
2
3
4
5
6
چکیده [English]

In this study, HYDRUS2D/3D software was used to estimate the hydraulic parameters of van Genuchten-Mualem model via inverse modeling using double-ring infiltrometers data in 3 different soil textures. Nine scenarios of inverse modeling (divided in three groups) were considered with different number (5, 4 and 3) of fitted hydraulic parameters for optimization. In the first group, simulation was carried out solely using cumulative infiltration data. In the second group, cumulative infiltration data plus water content at h = −330 cm (i.e. field capacity, FC) were used as inputs. In the third group, cumulative infiltration data plus water contents at h = −330 cm (FC) and h = −15000 cm (i.e. permanent wilting point, PWP) were used simultaneously as predictors. The results indicated that by reducing the number of hydraulic parameters involved in the optimization process, simulation error is reduced and the prediction accuracy of other soil hydraulic parameters would be increased. Including FC as an additional data was important to better optimize/define soil hydraulic functions. So using of (Saturated hydraulic conductivity) Ks, (Shape parameter of soil water characteristic curve) n and (the parameter that inversely related to the air entry value) a as predictor parameters an FC as an additional data was the best scenario. RMSE(cm3)، NRMSE، AIC، and R2 were respectively 1259, 528.2, 0.0081 and 0.9999 in Sandy Loam soil, 242, 79.0, 0.0059 and 0.9988 in Loamy soil and 298, 153.6, 0.0174 and 0.9983 in Silty Clay soil. Using PWP as additional data, increased the simulation error in all 3 soil textures.

کلیدواژه‌ها [English]

  • HYDRUS software
  • Numerical solution
  • Saturated Infiltration
  • Van Genuchten–Mualem model

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