scholarly journals Numerical Simulation of Deep Thermal Groundwater Exploitation in the Beijing Plain Area

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1494 ◽  
Author(s):  
Zhongping Xu ◽  
Xun Zhou ◽  
Ruige Chen ◽  
Ye Shen ◽  
Ziqi Shang ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Initial Water ◽  
Groundwater Exploitation ◽  
Groundwater Levels ◽  
Plain Area ◽  
Thermal Groundwater ◽  
Beijing Plain ◽  
Level Data ◽  
Water Level Data ◽  
3D Unsteady Flow

Thermal groundwater is relatively abundant in the deep-seated bedrock underlying the Beijing plain area. The main geothermal reservoir is composed of dolomites of the Wumishan Group of the Meso–Neoproterozic Jixian System. The thermal groundwater has been developed and utilized since the 1970s and significant declines in groundwater levels were observed. A 3D unsteady flow model of an anisotropic karst-fissure aquifer based on the equivalent continuum is used to describe the flow of thermal groundwater and heat transport. The heat transportation is described by the governing equation including convection and dispersion. The simulation of this paper aims to solve such problems as uneven distribution and thinness of the aquifer, insufficient initial monitoring data, and poor knowledge of the properties of the horizontal boundary. They are solved by considering vertical stratification of the aquifer with equal thickness, replacing initial water level data by surface elevation, and choosing natural boundary far away from the exploitation areas. Through a trial–error procedure, the simulated and measured groundwater level and temperature in the simulation period are well fitted. Three exploitation schemes are proposed to predict the spatial and temporal changes in groundwater level and temperature of the thermal groundwater in the study area. The prediction results show that the reinjection can effectively slow the decline in the thermal groundwater levels. Except for the Dongnanchengqu, Xiaotangshan, and Liangxiang subgeothermal fields, the other six subgeothermal fields have the potential for further development of thermal groundwater.

scholarly journals Analysis of Water Cycle in Weizhou Island of Beihai City, Guangxi Province, Part II: Study On Groundwater Exploitation Plan

2018 ◽  
Vol 246 ◽  
pp. 02047
Author(s):  
Shunfu Zhang ◽  
Changjun Liu ◽  
Chuanke Li ◽  
Sili Long ◽  
Jian Zhou ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Ground Water ◽  
Seawater Intrusion ◽  
Groundwater Level ◽  
Water Cycle ◽  
Variable Density ◽  
Analysis Model ◽  
Guangxi Province ◽  
Groundwater Exploitation ◽  
Groundwater Levels

To relieve the drop of groundwater and seawater intrusion in Weizhou Island caused by overexploitation, the analysis model of precipitation-runoff and variable-density groundwater flow in Weizhou Island was established and the model’s parameter identification results were used to investigate groundwater level and seawater/freshwater interface changes under different groundwater exploitation plans. Thereafter, a rational groundwater exploitation plan could be made to prevent the lowering of groundwater levels caused by ground water overexploitation and ecological deterioration caused by seawater intrusion. This could help accelerating the recovery of ground water and maintaining ecological system.

Prediction and Optimization of Groundwater Development in Beijing Plain

2013 ◽  
Vol 477-478 ◽  
pp. 878-882
Author(s):  
Hai Peng Guo ◽  
Li Ya Wang ◽  
Shan Shan Fan
Keyword(s):  
Index System ◽  
Groundwater Resources ◽  
Groundwater Development ◽  
Evaluation Index System ◽  
Current Status ◽  
Groundwater Exploitation ◽  
Groundwater Levels ◽  
Beijing Plain ◽  
System A ◽  
Development And Utilization

Groundwater plays an important role and accounts for two-thirds of the total water supply in Beijing plain. Overexploitation of groundwater has caused continuous decline in groundwater levels, land subsidence and other environmental and ecological problems. To analyze current status and predict future trends in groundwater resources, a 3D transient groundwater flow model was established and used to simulate various groundwater resources development schemes. With considering some facters such as groundwater exploitation, river outflow, groundwater levels and so on, an evaluation index system was constructed. Based on this index system a multi-object decision model was established for estimation of groundwater development schemes and proven to be very useful for scientific analysis of reasonable development and utilization of groundwater resources.

scholarly journals Spatial-temporal variation of groundwater and land subsidence evolution in Beijing area

2015 ◽  
Vol 372 ◽  
pp. 7-11
Author(s):  
K. Lei ◽  
Y. Luo ◽  
B. Chen ◽  
M. Guo ◽  
G. Guo ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Meteorological Data ◽  
Rapid Expansion ◽  
Persistent Scatterer Interferometry ◽  
Systematic Analysis ◽  
Groundwater Levels ◽  
Level Data ◽  
Regional Land

Abstract. Precipitation is the main recharge source of groundwater in the plain of Beijing, China. Rapid expansion of urbanization has resulted in increased built-up area and decreased amount of effective recharge of precipitation to groundwater, indirectly leading to the long-term over-exploitation of groundwater, and induced regional land subsidence. Based on the combination of meteorological data, groundwater level data, interferometric synthetic aperture radar (InSAR; specifically persistent scatterer interferometry, PSI), geographic information system (GIS) spatial analysis method and rainfall recharge theory, this paper presents a systematic analysis of spatial-temporal variation of groundwater level and land subsidence evolution. Results show that rainfall has been decreasing annually, while the exploitation of groundwater is increasing and the groundwater level is declining, which is has caused the formation and evolution of land subsidence. Seasonal and interannual variations exist in the evolution of land subsidence; the subsidence is uneven in both spatial and temporal distribution. In 2011, at the center of mapped subsidence the subsidence rate was greater than 120 mm a−1. The results revealed good correlation between the spatial distribution of groundwater level declines and subsidence. The research results show that it is beneficial to measure the evolution of land subsidence to dynamic variations of groundwater levels by combining InSAR or PSI, groundwater-level data, and GIS. This apprpach provides improved information for environmental and hydrogeologic research and a scientific basis for regional land subsidence control.

scholarly journals Study on compaction mechanism of overconsolidated soil and critical groundwater level in Cangzhou

2019 ◽  
Vol 79 ◽  
pp. 02010
Author(s):  
Yunlong Wang ◽  
Ye Chen ◽  
Haipeng Guo ◽  
Xisheng Zang
Keyword(s):  
Stress Analysis ◽  
Water Level ◽  
Water Resource ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Groundwater Exploitation ◽  
Groundwater Levels ◽  
Good Consistency ◽  
Long Time ◽  
Groundwater Overexploitation

Cangzhou area is facing increasingly serious land subsidence problem caused by groundwater overexploitation during a long time. In order to make effectively use of water resource and to limit the development of subsidence, it is necessary to establish the warning critical water level, that is, the subsidence rate will increase significantly as the water level depths exceeds the critical groundwater levels. In this paper, the 3rd aquifer group, the main groundwater exploitation layer, has been taken as a research object. The critical water level is calculated by stress analysis, and then determined by the correlation between the monitoring data of groundwater levels and subsidence. The calculated results indicate good consistency.

The Study of Groundwater Modeling of Plain Area in Shiyang River Basin - II Groundwater Modeling and Validation

2014 ◽  
Vol 937 ◽  
pp. 639-645 ◽  
Author(s):  
Yu Fei Cheng ◽  
Jun De Wang ◽  
Yuan Hong Li ◽  
Xiang Quan Hu ◽  
Shu Chao Lu
Keyword(s):  
Surface Water ◽  
River Basin ◽  
Groundwater Level ◽  
Groundwater Modeling ◽  
Western China ◽  
Groundwater Model ◽  
Groundwater Levels ◽  
Plain Area ◽  
Inland River ◽  
Shiyang River Basin

Groundwater is an important resource, it is used for variety of purposes in the inland river basins of arid western China. In recent years, the utilization ratio of surface water has been raised, the groundwater recharge rate from surface water has been reduced, and the aquifer depletion due to over-exploitation, which has led to the decline of groundwater levels and the degradation of eco-environments in the Shiyang River Basin, especially in Minqin. Therefore, the study on the groundwater levels change in recent years, as well as simulating and predicting groundwater levels in the future have gotten very important. The purpose of this study is to analyze the groundwater level variations of the study area. Basin on a conceptual groundwater model and observation groundwater level data, to establish the groundwater flow model by FEFLOW; simulated and validated the groundwater model. Finally the precision of model was evaluated. It was shown that the model could be used to predict the groundwater levels variation under different hypothesis conditions in Shiyang River Basin, which would provide the effective reference to the rational use and management of the groundwater.

scholarly journals Rancang Bangun Monitoring Level Muka Air Tanah Di Perkebunan Lahan Gambut Menggunakan SMS Sebagai Pengirim Informasi Data Berbasis Mikrokontroler

2019 ◽  
Vol 6 (1) ◽  
pp. 62
Author(s):  
I Wayan Eka Prastia ◽  
I Wayan Arta Wijaya ◽  
I Wayan Sukerayasa
Keyword(s):  
Water Level ◽  
Groundwater Level ◽  
Oil Palm ◽  
Rainy Season ◽  
Ground Level ◽  
Dry Season ◽  
Level Data ◽  
Water Level Data ◽  
Level Monitoring ◽  
Water Level Monitoring

The fires of peatlands on oil palm plantations are very vulnerable to occur in the dry season. Fires will arise due to a decrease in the surface of the water resulting in the top layer of peatland becoming dry. Manually monitoring ground level is very difficult. The solution is to make a remote water level monitoring prototype in order to be able to regulate irrigation on peat land and make the system open and close the irrigation door during the dry season and when the rainy season arrives. The design of groundwater level monitoring uses a program installed on the Arduino Uno microcontroller.Water level data is sent by prototype via GSM SIM 800L network, 8 level conditions that have been determined from a depth of 15 cm multiples of five so on to 55 cm. HC-SR04 Ultrasonic Sensor is a detector for water level. Data can be accessed at any time via SMS by sending "Check" to the prototype. The results of the tests performed indicated that the tool can function in accordance with the design and send information as well as receive monitoring orders.

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