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استفاده از خصوصیات منحنی تراکم خاک برای تخمین رطوبت خاک با استفاده از مدل ون‌گنوختن | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 1، دوره 47، شماره 2، مرداد 1395، صفحه 217-228 اصل مقاله (743.45 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2016.58328 | ||
| نویسندگان | ||
| عیسی ابراهیمی* 1؛ حسین بیات2؛ سعیده صادقی3؛ محبوبه فلاح4؛ محمد جره5؛ محمد زنگنه6 | ||
| 1دانشگاه بو علی سینا همدان | ||
| 2استادیار گروه خاکشناسی دانشکده کشاورزی دانشگاه بو علی سینا همدان | ||
| 3کارشناسی ارشد فیزیک و حفاظت خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| 4دانش آموخته کارشناسی ارشد فیزیک و حفاظت خاک دانشگاه گیلان | ||
| 5کارشناسی ارشد فیزیک و حفاظت خاک، دانشگاه بو علی سینا همدان | ||
| 6دانشجوی کارشناسی ارشد مهندسی آب، دانشگاه بو علی سینا همدان | ||
| چکیده | ||
| مدل ون‌گنوختن معروفترین و پرکاربردترین مدل منحنی نگهداشت آب خاک است. پارامترهای این مدل توسط تخمینگرهای مختلف از جمله بافت خاک تخمین زده شده‌اند. اما تا کنون از خصوصیات منحنی تراکم جهت تخمین پارامترهای مدل ون‌گنوختن و نهایتا رطوبت خاک استفاده نشده است. منحنی تراکم یکی از خصوصیات مکانیکی خاک است و رابطه بین تنش- کرنش با مدول الاستیسته در خاک را نشان می‌دهد. دو منحنی نگهداشت آب خاک و منحنی تراکم دارای شباهت‌هایی هستند. اندازه‌گیری منحنی نگهداشت آب در خاک زمان‌بر و هزینه‌بر است در صورتی که اندازه‌گیری منحنی تراکم ارزان و سریع است. برای انجام این تحقیق 150 نمونه خاک از پنج استان ایران به صورت دست خورده و دست نخورده برداشت شد. نگهداشت آب در خاک در دوازده مکش اندازه‌گیری شد. منحنی تراکم با استفاده از دستگاه تک محوری به صورت نمونه محصور بدست آمد. در این طرح از شش سطح تخمینگر که شامل خصوصیات تراکمی و ضرایب معادلاتی هستند برای تخمین رطوبت خاک استفاده شد. استفاده از خصوصیات منحنی تراکم موجب بهبود تخمین منحنی نگهداشت آب خاک در هر دو مرحله اموزش و ازمون مدل گردید. سطوح دوم و ششم به‌ترتیب با تخمینگرهای تنش پیش تراکمی-شاخص تراکم- شاخص تورم و پارامترهای معادله تنش-پوکی (به‌صورت غیر مستقیم)، علاوه بر خصوصیات پایه، نسبت به سایر سطوح دقت تخمین بالاتری داشتند (IRMS=0.092). علت برتری این تخمینگر‌ها را می‌توان همبستگی آن‌ها با ضرایب مدل ون‌گنوختن و مفهوم مکانیکی تخمینگر‌ها دانست. همچنین تشابه شکل دو منحنی با هم نیز یکی از علل تخمین مناسب رطوبت بود. | ||
| کلیدواژه‌ها | ||
| تنش پیش تراکمی؛ مدل؛ منحنی نگهداشت آب خاک؛ منحنی تراکم | ||
| عنوان مقاله [English] | ||
| Using compression curve characteristics to estimate water content by the van Genuchten model | ||
| نویسندگان [English] | ||
| Eisa Ebrahimi1؛ Hosein Bayat2؛ Saeedeh sadeghi3؛ mahbobeh fallah4؛ Mohammad Jorreh5؛ Mohammad zanganeh6 | ||
| 1Bu Ali Sina Hamedan University | ||
| 3MSc in physics and soil conservation Gorgan University of Agricultural Sciences and Natural | ||
| 5MSc in soil physics and conservation at Bu Ali Sina Hamedan University | ||
| 6MSc in engineering water at Bu Ali Sina Hamedan University | ||
| چکیده [English] | ||
| van Genuchten model is a well-known and most widely used model for the estimation of soil water retention curve. The parameters of this model have been estimated by different estimators such as soil texture. But so far the properties of compaction curve have not been used to estimate the parameters of van Genuchten model. Compaction curve is one of the soil mechanical properties and shows the relationship between the stress-strain with the elasticity modulus. Soil water retention and compaction curves have similarities. Measurement of soil water retention curve is time-consuming and costly while the measurement of compaction curve is cheap and needs less time. For this study, 150 soil samples (distributed and undistributed) were collected from five provinces of Iran. Soil water retention was measured at 12 suctions and the compaction curve was obtained using uniaxial apparatus in the confined sample. In this research, 6 levels of estimators including compaction characteristics and equations coefficients were used to estimate water content. In general, results showed that the use of compaction curve was useful to estimate the soil water retention curve. The second and sixth levels with the estimators of Pc-Cc-Cs and parameters of stress-strain model (indirectly), respectively along with basic soil properties had higher estimation accuracy compared to other estimator levels. The reason for the excellence of these estimators can be due to their correlation with van Genuchten model parameters and mechanical concept of estimators. Moreover, the similarity between the two curves was one of the reasons for the appropriate estimation of soil water retention curve. | ||
| کلیدواژه‌ها [English] | ||
| Precompression Stress, model, Soil Water Retention Curve, Compression Curve | ||
| مراجع | ||
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