نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی و مدیریت آب، دانشگاه تربیت مدرس، تهران، ایران
2 دانشکده مهندسی، دانشگاه بریتیش کلمبیای شمالی، بریتیش کلمبیا، کانادا
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Groundwater recharge in the Marvdasht aquifer was estimated using two approaches: the water table fluctuation (WTF) method and unsaturated zone flow simulation with the HYDRUS-1D model. In the first approach, recharge was calculated based on variations in groundwater level and specific yield, whereas in the second approach, it was estimated using soil column hydraulic properties within the unsaturated zone. The average recharge for the entire study area was estimated at 291.3 million cubic meters using HYDRUS-1D and 204.7 million cubic meters using the WTF method, indicating a difference of 29.7%. This discrepancy can be attributed to the fundamental differences in the assumptions underlying the two approaches. HYDRUS-1D simulates infiltration and recharge dynamically by solving Richards’ equation and considering the soil hydraulic parameters and boundary conditions, while the WTF method indirectly estimates recharge based on groundwater level fluctuations and specific yield, and is therefore sensitive to the accuracy of these observations. Zonation maps revealed that both methods produced similar spatial recharge patterns. Moreover, analysis of water infiltration delay through the unsaturated zone indicated that the lag time varied between 30 and 730 days, depending on soil texture and the thickness of the unsaturated zone. It is recommended that, where data availability permits, multiple methods be applied to assess groundwater recharge, thereby obtaining more reliable estimates of this critical parameter and supporting sustainable management and optimal utilization of groundwater resources.
کلیدواژهها [English]
)