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شبیه‌سازی توزیع دو بعدی رطوبت خاک طی آبیاری قطره‌ای زیرسطحی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 7، دوره 46، شماره 2، تیر 1394، صفحه 221-229 اصل مقاله (1.36 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2015.55927 | ||
| نویسندگان | ||
| فاطمه نایب لویی1؛ مهدی کوچک زاده* 2؛ کیومرث ابراهیمی3؛ مهدی همایی4؛ فریبرز عباسی5 | ||
| 1دانشجوی دکتری مهندسی آبیاری و زهکشی دانشگاه تربیت مدرس | ||
| 2دانشیار گروه مهندسی آبیاری و زهکشی دانشگاه تربیت مدرس | ||
| 3دانشیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران | ||
| 4استاد گروه خاک‌شناسی دانشگاه تربیت مدرس | ||
| 5استاد مرکز تحقیقات فنی مهندسی وزارت جهاد کشاورزی | ||
| چکیده | ||
| آگاهی از مقدار و توزیع رطوبت در آبیاری زیرسطحی در مدیریت آب مزرعه اهمیت فراوان دارد. هدف این پژوهش شبیه‌سازی توزیع پساب در خاک با درنظرگرفتن اثر جذب ریشه و تبخیر از سطح خاک، تحت آبیاری قطره‌ای زیرسطحی، بود. بدین منظور، مزرعهای آزمایشی انتخاب و کاهو در آن کاشته شد تا دادههای مورد نیاز از آن جمعآوری شود. ویژگیهای هیدرولیکی خاک با استفاده از دادههای واقعی پتانسیل ماتریک و رطوبت حجمی خاک تعیین شد. پتانسیل ماتریک خاک در دامنۀ تانسیومتری به کمک تانسیومتر و رطوبت خاک، به وسیلة دستگاه TDR، به دست آمد. برای شبیه‌سازی از مدل HYDRUS-2D استفاده شد. نتایج شبیه‌سازی مکانی نشان داد این مدل در نقاط دورتر از قطرهچکانها و با عمق بیشتر (03/0(RMSE= در مقایسه با نقاط نزدیک به قطرهچکان و عمق کمتر (008/0RMSE=) نتایج بهتری ارائه میدهد. نتایج شبیه‌سازی زمانی نیز نشان داد مدل چهل و هشت ساعت پس از آبیاری (005/0RMSE=) دقیقتر از یک ساعت پس از آبیاری عمل میکند (029/0RMSE=). بدین ترتیب، میتوان دریافت، هنگامی که فرایندهای جذب آب به وسیلۀ ریشه و تبخیر فعال است، مدل توانایی مناسبی برای شبیه‌سازی رطوبت خاک تحت آبیاری زیرسطحی دارد. | ||
| کلیدواژه‌ها | ||
| آبیاری زیرسطحی؛ پساب؛ شبیه‌سازی؛ Hydrus | ||
| عنوان مقاله [English] | ||
| Simulation of 2D Soil Moisture Distribution under Subsurface Drip Iirrigation | ||
| نویسندگان [English] | ||
| Fatemeh Nayebloie1؛ Mahdi Kouchakzadeh2؛ Kumars Ebrahimi3؛ Mahdi Homaee4؛ Fariborz Abbasi5 | ||
| 1Ph.D. Candidate, Tarbiat Modarres University | ||
| 2Associate Professor, Irrigation and Drainage Engineering Department, Tarbiat Modarres University | ||
| 3Associate Professor, Irrigation and Reclamation Engineering Department, University of Tehran | ||
| 4Professor, Department of Soil Science, Tarbiat Modarres University | ||
| 5Professor, Agricultural Engineering Research Institute, Ministry of Jahad-e-Keshavarsi | ||
| چکیده [English] | ||
| Information on water soil content and its distribution is vital for field water management in subsurface irrigation. The objective followed in this study was to simulate the extent of wastewater distribution taking into account root water uptake and evaporation from the soil surface under, subsurface drip irrigation system. In this regard, a field experiment was conducted with lettuce as the crop, to collect the required data. Soil hydraulic properties were obtained through an assessment of in-situ soil water pressure heads as well as water contents. Soil matric potentials, under tensiometery range, were obtained by use of tensiometers and the related water contents by a TDR instrument. For the simulation purposes, the HYDRUS-2D model was made use of. The model performance was evaluated by comparing the measured us the predicted values using Root Mean Square Error (RMSE) statistics. The results of the spatial simulation revealed that this model provides more appropriate results in locations farther away, and deeper than The drippers (RMSE=0.03) as compared with the points adjacent to the droppers and less deeper ones (RMSE=0.008). The results of the temporal simulation showed that the model worked more accurately within 48 hrs after irrigation (RMSE=0.005) rather than one following the start of irrigation (RMSE=0.029). Therefore, it can be concluded that soil water content in subsurface drip irrigation system can be reasonably simulated while root water uptake and evaporation processes are both actively going on. | ||
| کلیدواژه‌ها [English] | ||
| simulation, subsurface Irrigation, Wastewater, Hydrus | ||
| مراجع | ||
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