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Numerical Investigation of Groundwater Balance and Artificial Recharge in the Kerman-Baghin Aquifer

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Numerical Investigation of Groundwater Balance and Artificial Recharge in the Kerman-Baghin Aquifer Journal of Hydraulic Structures J. Hydraul. Struct., 2021; 7(2):1-21 DOI: 10.22055/jhs.2021.36940.1166 Numerical investigation of groundwater balance and artificial recharge in the Kerman-Baghin Aquifer Sina Pakmanesh 1 Mahnaz Ghaeini-Hessaroeyeh 2 Ehsan Fadaei-Kermani 3 Abstract In the present paper, the behavior of Kerman-Baghin aquifer has been investigated using the MODFLOW program and GMS 10.3 software. The piezometer data during October 2011 are applied for steady state condition of groundwater modeling. Then, the model is calibrated for 66 months for unsteady condition using observational information, and it is validated for 24 months. Finally, the results are compared with the available observed data and show acceptable accuracy in calibration and validation steps. After validating the model, the status of the aquifer is estimated for a period of 5 years. Management scenarios including 10, 20 and 30 percent reduction in groundwater abstraction as well as artificial recharge at eight selected aquifer sites have been investigated. The location of artificial recharge sites is selected based on seven parameters of land slope, distance from waterways, distance from faults, electrical conductivity, hydraulic conductivity, geology of the area and groundwater depth (thickness of unsaturated area). These parameters are combined with the index overlay method by Arc GIS 10.3 software. The results show that by continuing the current situation, the Kerman-Baghin aquifer could face an average annual deficit of more than 52 million cubic meters. It may cause various problems in the near future including abstraction water from groundwater sources and reducing water quality. The results of implementing different scenarios show that, the best scenario can be obtained by 10% reducing water withdrawal with artificial recharge in four zones 1, 2, 10 and 12. Keywords: Numerical modeling, Groundwater, Artificial recharge, GMS, MODFLOW. Received: 19 March 2021; Accepted: 04 May 2021 1 Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran. Email: [email protected] 2 Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran. Email: [email protected] (Corresponding author) 3 Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran. Email: [email protected] SPRING 2021, Vol 7, No 2, JOURNAL OF HYDRAULIC STRUCTURES Shahid Chamran University of Ahvaz 2 S. Pakmanesh, M. Ghaeini-Hessaroeyeh, E. Fadaei-Kermani 1. Introduction Iran is located among the arid and semi-arid regions, so water resources are of special importance. In most regions of the country, due to the lack of permanent surface water resources and also precipitation shortage, especially in desert and hot areas, groundwater resources are the only reliable and available resources. Most of the water consumption in Iran is supplied from groundwater resources, and the exploitation of groundwater has long been common in the country [1]. Proper management and optimal use of groundwater resources is necessary to maintain these resources. Understanding the behavior of aquifers requires geophysical experiments, drilling numerous exploratory wells, pumping operations, and spending a lot of time and money. Numerical simulation of groundwater flow is an indirect study method that can lead to an understanding of aquifer behavior at a lower cost rather than direct methods. The knowledge obtained from aquifers can result to solve the problems of aquifers. If a mathematical model is applied accurately, it can be used to predict the state of water resources in the future, and to explain the effect of conditions applied to a groundwater aquifer [2]. Due to the importance of modeling and managing water resources, various researches have been conducted on this subject. Simulation of groundwater resources in Sirjan plain using MODFLOW model was investigated by Najafabadi et al., 2007 in order to manage water resources in this plain. This study, referring to the change in the method of exploiting groundwater and the use of deep wells instead of using aqueducts, considered uncontrolled extraction and reduction of water level as the consequences of changes in the method of exploitation and use of deep wells. According to the hydrograph of the plain unit, the average annual drop of the water table in different parts of the plain is 70 cm per year and in the western areas of the plain due to the concentration of exploitation wells is about 2 meters per year. This has caused the influx of saline water aquifer to the Sirjan plain and the decrease of groundwater quality in these areas [3]. Yang et al., 2011 conducted a study of a 400-square-kilometer groundwater aquifer in the Chinese city of Tangli. A 3D modeling of the groundwater aquifer was done by MODFLOW software. It was concluded that the results of the model and the performed measurements are acceptable. This model can be used in the future to manage the aquifer and compare different scenarios of exploitation and management [4]. Al-Hassoun and Mohammad, 2011 studied an aquifer in Saudi Arabia. Numerical modeling of the aquifer based on extraction, rainfall, aquifer recharge, boundary conditions and hydrological conditions of the aquifer was performed by MODFLOW software. Results indicated that MODFLOW software performs simulations in dry areas with appropriate accuracy. It was also found that in the five-year period in which the simulation was performed, the decline in the water levels is not significant. This allows for more groundwater abstraction without serious impact on aquifer storage [5]. Sikdar and Chakraborty, 2017 investigated groundwater aquifers in northern India. Using the MODPATH software, the numerical model of the aquifer was created according to the amount of abstraction (based on the per capita consumption of the population of the region) and other boundary conditions and hydraulic conditions of the aquifer. The simulation was used to determine the effect of pumping on arsenic concentration in groundwater aquifers and water resources of North Bengal plain. Results showed that the path of arsenic in the groundwater aquifer is almost vertical [6]. Salameh et al., 2019 conducted a study on aquifers in Jordan. The purpose of this study was to evaluate the success or failure of aquifer artificial recharge projects and also to define a SPRING 2021, Vol 7, No 2, JOURNAL OF HYDRAULIC STRUCTURES Shahid Chamran University of Ahvaz Numerical Investigation of Groundwater balance … 3 management method for recharge and abstraction aquifers. In the study, according to the quality and amount of water abstracted from aquifers, topographic conditions and hydraulic conditions of aquifers, including the capacity and amount of recharge and water quality, a suitable structure for abstraction and recharge of each aquifer was proposed. As a result of this study, it was found that artificial recharge of groundwater aquifers can be useful in some aquifers and may not have good results in some others [7]. Norouzi et al., 2019 investigated the potential zones of groundwater artificial recharge in Shabestar region, northwest of Iran. They proposed a learning method based on ensemble decision trees, namely random forest model to determine the location of groundwater artificial recharge. Results showed the high accuracy of RF model in locating groundwater artificial recharge [8]. Sharafati et al., 2020 presented a new approach for prediction of the monthly groundwater level over the Rafsanjan aquifer located in Iran. They proposed an ensemble machine learning algorithm named Gradient Boosting Regression. The results showed that the proposed method is capable and reliable for water resources planning [9]. Alem et al., 2021 proposed a method based on GIS analysis to estimate the ground water recharge amount in the Mashhad plain, Iran. The study aimed to identify potential locations for developing karst formations using calculating infiltration percentage of formations [10]. The present paper deals with numerical investigation of groundwater balance in the Kerman- Baghin Aquifer. The area is among arid and semi-arid regions, and due to the lack of surface water resources, groundwater considered as the only available resource. According to recent droughts, the elevation of water table is decreased. A part of the Kerman-Baghin aquifer with an area of 357 Km2 was modeled by Tahmasebi (2013) using the data of the year 2002. In the present study, the total area of the aquifer ,5420 Km2 is considered. Furthermore, it is tried to numerically detect the aquifer balance and artificial recharge and some possible management solutions have been presented to return the aquifer to the acceptable level. Therefore, at first, all meteorological, hydrological, hydrogeological, geophysical, geological and geographical information of the plain has been analyzed. The main purpose of this research is the quantitative simulation of groundwater in the Kerman-Baghin plain by GMS software. This simulation is conducted by the MODFLOW program. With a quantitative simulation, the current trend of the plain can be examined. Predicting the future status of the aquifer under different management options can be considered as the final result of current numerical modeling. 2.1. Materials and Methods 2.2. The geographical location of the region Kerman-Baghin study area with geographical coordinates of 56° and 30 minutes to 57° and 30 minutes of
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