بررسی تغییرات مکانی نفوذپذیری خاک با استفاده از روش‌های تجربی و زمین‌آماری در دشت ساحلی بهشهر- گلوگاه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 دانشگاه علو کشاورزی و منابع طبیعی ساری

چکیده

فرآیند نفوذ در هیدرولوژی سطحی و زیرسطحی نقشی مهم ایفا کرده و عامل کلیدی در تمام معادلات بارش و رواناب می­باشد. پژوهش حاضر، به­منظور بررسی نفوذپذیری خاک در منطقه بهشهر-گلوگاه انجام پذیرفت. ازآنجایی‌که بیشتر محصولات کشاورزی این منطقه در اراضی دشتی و ساحلی کشت می­شود، هم­چنین با توجه به اهمیت نفوذ­پذیری آب در خاک در اراضی کشاورزی، مطالعات نفوذ­پذیری در این منطقه ضروری به نظر می­رسد. بدین منظور، یک شبکه km10km×8 برای نمونه­برداری در نظر گرفته شده و در مجموع 80 نقطه برای نمونه­برداری انتخاب گردید. اندازه­گیری نفوذ آب در خاک با استفاده از روش استوانه تک­حلقه با در نظر گرفتن ارتفاع نفوذ یک سانتی­متر و زمان متغیر، انجام پذیرفت. پس از برداشت نفوذ مشاهده­ای، با استفاده از دو معادله هورتون و کوستیاکوف، برآورد سرعت نفوذ آب در خاک نسبت به مقادیر مشاهده­‌ای انجام و مورد ارزیابی قرار گرفت. جهت انتخاب مدل مناسب، آماره­های سنجش خطا شامل مجذور میانگین مربعات خطا، خطای نسبی و ضریب ناش ساتکلیف برای هر معادله مورد سنجش قرار گرفت که مقادیر این آماره­ها در ارتباط با معادله هورتون به­ترتیب 55/5، 61/24 و 98/0 و برای معادله کوستیاکوف به­ترتیب 5/8، 14/34 و 96/0 به­دست آمد. نتایج نشان داد که معادله هورتون دارای دقت بیشتری نسبت به معادله کوستیاکوف در برآورد میزان نفوذ نسبت به مقادیر مشاهده‌ای در این منطقه می­باشد. همچنین، بررسی تغییرات مکانی نرخ نفوذپذیری با کمک نرم­افزار GS+ نشان داد که تمامی تغییرنماهای متغیر مورد مطالعه همسان­گرد می‌باشند و وابستگی مکانی قوی بین نفوذپذیری آب در خاک وجود داشته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Spatial changes in Soil infiltration Using Experimental and Geostatistical Methods in coastal plain of Behshahr-Galugah

نویسندگان [English]

  • ataollah kavian 1
  • reza ahmadi 1
  • mahmud habibnejad 2
  • zeinab jafarian 1
1 sari agricultural sciences and natural resources university
2 sari agricultural sciences and natural resources university
چکیده [English]

Infiltration plays an important role in surface and subsurface hydrology and is a key factor in the whole rain fall-run off equations. This research was carried out Behshahr- Galugah coastal plain. With attention to most agricultural crops of region are grown in this plain and the importance of water permeability in soils, permeability studies in this area seem necessary. 10 km × 8 km grid was used to sample with the grid cell size is 1000 m2. Measuring water infiltration was performed using a single cylindrical ring considering infiltration height of 1 cm and variable time. After the measurements, the infiltration rate of the soil was estimated using both Horton and Kostiakov equations and was compared to the observed values. For selection of an appropriate model evaluation criteria including RMSE, RE and NSS for each equation were used. The values of these criteria for Horton equation were 5.55, 24.61 and 0.98 and for Kostiakov equation were equal to 8.5, 64.14 and 096, respectively. The results showed that the Horton equation has more accuracy in estimation of infiltration to Kostiakov equation compared with observed values in this region. Also investigation of spatial variability of permeability rate with GS+ version 5 software was showed that semivariogram of variable was isotropic and there was strong spatial dependence between water permeability.

کلیدواژه‌ها [English]

  • Geostatistic
  • Horton equation
  • Infilteration
  • Kostiakov equation
  • Single Ring
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