Estimation of Equilibrium Convection-Dispersion Equation Parameters from Soil Hydraulic Data
Author(s):
Abstract:
Dispersivity (λ) and effective transport porosity (eff) are input parameters in equilibrium Convection Dispersion Equation (CDE). Normally these parameters are obtained from breakthrough curves by inverse method. However, obtaining breakthrough curves in the field is not often possible in practice. The objective of this study was to estimate λ and feff from soil hydraulic data. For this purpose a conceptual model was developed which describes the transport of a nonreactive solute based on soil hydraulic properties. Both deterministic and stochastic simulation approaches are made use of. The breakthrough data obtained from the simulations were utilized to estimate transport parameters through inverse method. Results revealed that there was no significant difference between predicted and observed λ at P < 0.05 in stochastic approach. However the procedure tends to over-predict small values of λ, while under-predicting large values of λ, especially in the deterministic approach. The estimates of the effective transport porosity being less than those of total porosity (), indicated that only a portion of total porosity takes part in solute transport. This procedure can be utilized to estimate λ and eff from soil hydraulic properties in each and any scale.
Language:
Persian
Published:
Iranian Journal of Soil and Water Research, Volume:42 Issue: 2, 2012
Page:
241
https://magiran.com/p986351
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یکساله به مبلغ 1,390,000ريال میتوانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.
In order to view content subscription is required
Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!