Simulation of effects of agricultural activities on groundwater level by combining FEFLOW and GIS

Huo, Zailin; Feng, Shi-Ming; Kang, Shaozhong; Cen, S. J.; Ying, Ma

doi:10.1080/00288230709510358

Cited by 18 publications

(10 citation statements)

References 17 publications

(13 reference statements)

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“…Then the pumped groundwater volume is calculated on the basis of the utilization coefficients of the canal systems. The detailed calculating flow chart for this source/sink terms can be found in Huo et al (2007b).…”

Section: The Study Areamentioning

confidence: 99%

Numerically modelling groundwater in an arid area with ANN‐generated dynamic boundary conditions

Huo

Feng

Kang

et al. 2010

Hydrological Processes

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Abstract:Groundwater is sensitive to the climate change and agricultural activities in arid and semi-arid areas. Over the past several decades, human activities, such as groundwater extraction for irrigation, have resulted in aquifer overdraft and disrupted the natural equilibrium in these areas. Regional groundwater simulation is important to determine appropriate groundwater management policies, and numerical simulation has become the most popular method. However, most groundwater models were developed with static boundary conditions. In this research, the Minqin oasis, an arid region located in northwest China, was selected as the study area. An artificial neural network (ANN) was developed to simulate effects of weather conditions, agricultural activities and surface water on groundwater level in a dynamic boundary of the domain. Subsequently, a groundwater numerical model, named ANN-FEFLOW model, was developed, with a dynamic boundary condition defined by the ANN model. The verifying results showed that the model has higher precision, with a root mean square error (RMSE) of 0Ð71 m, relative error (RE) of 17Ð96% and R 2 of 0Ð84 relative to the great groundwater change. Furthermore, the groundwater model has higher precision than the conventional groundwater model with static boundary condition, particularly in the area near the dynamic boundary. This study demonstrated that dynamic boundaries can improve the precision of the regional groundwater model in an arid area and that ANN can provide higher accuracy prediction capability for groundwater levels with dynamic boundary.

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Section: The Study Areamentioning

confidence: 99%

Numerically modelling groundwater in an arid area with ANN‐generated dynamic boundary conditions

Huo

Feng

Kang

et al. 2010

Hydrological Processes

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“…Numerical models have been used successfully for simulating and predicting groundwater levels for many years (Zhao et al 2005;Matej et al 2007;Wen et al 2007;Huo et al 2007b). In arid areas, the agricultural sector is by far the major user of water resources, and groundwater is an important water resource for irrigation.…”

Section: Introductionmentioning

confidence: 99%

Groundwater simulation using a numerical model under different water resources management scenarios in an arid region of China

et al. 2010

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Groundwater plays an important role in the economic development and ecological balance of the arid area of northwest China. Unfortunately, human activity, for example groundwater extraction for irrigation, have resulted in excessive falls in groundwater level, and aquifer overdraft in the oasis, disrupting the natural equilibrium of these systems. A groundwater numerical model for Minqin oasis, an arid area of northwest China, was developed using FEFLOW software to simulate regional groundwater changes under transient conditions. The vertical recharge and discharge (source/sink terms) of the groundwater models were determined from land-use data and irrigation systems for the different crops in the different sub-areas. The calibrated model was used to predict the change for the period from 2000 to 2020 under various water resources management scenarios. Simulated results showed that under current water resources management conditions groundwater levels at Minqin oasis are in a continuous drawdown trend and groundwater depth will be more than 30 m by 2020. Reducing the irrigation area is more effective than watersaving irrigation to reduce groundwater decline at Minqin oasis and the annual groundwater budget would be -0.978 9 10 8 m 3 . In addition, water-diversion projects can also reduce the drawdown trend of groundwater at Minqin oasis, and the groundwater budget in the Huqu sub-area would be in zero equilibrium if the annual inflow into the oasis was enhanced to 2.51 9 10 8 m 3 . Furthermore, integrative water resources management including waterdiversion projects, water-saving irrigation, and reducing the irrigation area are the most effective measures for solving groundwater problems at Minqin oasis.

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“…A detailed groundwater model, used as a predictive and analytic tool, was required for comprehensive water resources planning. Huo et al (2007) developed a two-dimensional phreatic groundwater flow model in the basin, describing the aquifer as a simple one layer. It cannot fully represent the three-dimensional groundwater flow in the aquifer.…”

Section: Introductionmentioning

confidence: 99%

Water resources assessment in the Minqin Basin: an arid inland river basin under intensive irrigation in northwest China

Zhang

Chang

et al. 2011

Environ Earth Sci

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The Minqin Basin is at the lower reach of the Shiyang River of Gansu province in northwest China. Dramatic decline in groundwater level has resulted from over-abstraction of groundwater since the late 1950s to satisfy increasing irrigation and other demands. Severe water shortage led to environmental degradation. To better understand the spatial-temporal variation of groundwater levels and to evaluate the groundwater resources in the region, a three-dimensional regional groundwater flow model was built and calibrated under transient condition. The MODFLOW program was used and the research area was discretized as a square network with cell size of 400 9 400 m. The model showed that the aquifer was under destructive stress, with a groundwater resource deficit of 260 million cubic meters per year (Mm 3 /year) on average. Since the inflow of surface water from the upstream basin has declined to about 100-150 Mm 3 /year in recent decades, the irrigation return flow had become the main recharge and accounted for 60.6% of total recharge; meanwhile, abstraction by pumping wells took 99.2% from the total groundwater discharge.

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Simulation of effects of agricultural activities on groundwater level by combining FEFLOW and GIS

Cited by 18 publications

References 17 publications

Numerically modelling groundwater in an arid area with ANN‐generated dynamic boundary conditions

Numerically modelling groundwater in an arid area with ANN‐generated dynamic boundary conditions

Groundwater simulation using a numerical model under different water resources management scenarios in an arid region of China

Water resources assessment in the Minqin Basin: an arid inland river basin under intensive irrigation in northwest China

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