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 and Temporal Changes of Groundwater Storage in the Quaternary Aquifer, UAE

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 864
Author(s):  
Mohsen Sherif ◽  
Ahmed Sefelnasr ◽  
Abdel Azim Ebraheem ◽  
Mohamed Al Mulla ◽  
Mohamed Alzaabi ◽  
...  
Keyword(s):  
Water Resources ◽  
Brackish Water ◽  
Initial Conditions ◽  
Groundwater Resources ◽  
Effective Porosity ◽  
Groundwater Storage ◽  
Fresh Groundwater ◽  
Groundwater Exploitation ◽  
Quaternary Aquifer ◽  
Groundwater Levels

To study the temporal and spatial variations of the groundwater quantity and quality in response to intensive groundwater exploitation from the Quaternary aquifer in UAE, a water budget model with a cell size of one km2 was developed. The available historical records of groundwater levels and salinity have been used to develop the water table and salinity maps of UAE for the years 1969, 2005, 2010, and 2015. The available water resources and soil information system was used to facilitate validity, cogency, and consistency of the groundwater analysis. The spatial analysis module of GIS was used to define the aquifer setting, saturated thickness, aquifer base elevation, effective porosity, and groundwater salinity at each grid cell. The obtained results indicated that the volume of fresh groundwater resources in the Quaternary aquifer in UAE has decreased from 238 km3 in 1969 to around 10 km3 in 2015. A major part of these depleted fresh groundwater resources was replaced by brackish water, and, therefore, the total groundwater storage in this aquifer has only decreased from 977 in 1969 to 922 km3 in 2015, respectively. If the same groundwater exploitation continues, the freshwater storage in the surficial aquifer might be totally depleted in agricultural areas. Most probably, the brackish groundwater resources will be exploited. In such areas, more attention should be devoted to the management of brackish water resources to avoid the exacerbation of the saltwater intrusion problem. Despite the fact that the obtained results indicate the negative impacts of the improper water resources management in a small part of the arid area, the learned lessons are valid for other arid countries, in particular, using the proper steady state boundary conditions for the initial conditions in modeling the available future management alternatives.

Credit Evaluation Index System of Construction Enterprises

2012 ◽  
Vol 209-211 ◽  
pp. 1423-1428
Author(s):  
Chun Jie Ma ◽  
Yan Ting Ma
Keyword(s):  
Index System ◽  
Objective Evaluation ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Current Status ◽  
Credit Crisis ◽  
Analytic Hierarchy ◽  
Credit Evaluation ◽  
Construction Enterprises ◽  
And Cluster Analysis

Based on the analysis of the current status on the credit crisis of construction enterprises, this paper established the Credit Evaluation Index System of Construction Enterprises combined with modern characteristics in the industry. By using the method of Analytic Hierarchy Process and Cluster Analysis, we determine the weight of each index, and then calculate each index data using fuzzy mathematic principle. Thus give an objective evaluation on the credit situation of construction enterprises.

scholarly journals Groundwater Governance in Pakistan: From Colossal Development to Neglected Management

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3017 ◽  
Author(s):  
Asad Sarwar Qureshi
Keyword(s):  
Water Resource Management ◽  
Groundwater Resources ◽  
Soil Salinization ◽  
Irrigated Agriculture ◽  
Management Approach ◽  
Groundwater Abstraction ◽  
Local Conditions ◽  
Groundwater Exploitation ◽  
Groundwater Levels ◽  
The World

Groundwater is playing an essential role in expanding irrigated agriculture in many parts of the world. Pakistan is the third-largest user of groundwater for irrigation in the world. The surface water supplies are sufficient to irrigate 27% of the area, whereas the remaining 73% is directly or indirectly irrigated using groundwater. The Punjab province uses more than 90% of the total groundwater abstraction. Currently, 1.2 million private tubewells are working in the country, out of which 85% are in Punjab, 6.4% are in Sindh, 3.8% are in Khyber-Pakhtunkhwa, and 4.8% are in Baluchistan. The total groundwater extraction in Pakistan is about 60 billion m3. The access to groundwater has helped farmers in securing food for the increasing population. However, unchecked groundwater exploitation has created severe environmental problems. These include rapidly falling groundwater levels in the irrigated areas and increased soil salinization problems. The groundwater levels in more than 50% of the irrigated areas of Punjab have dropped below 6 m, resulting in increased pumping cost and degraded groundwater quality. Despite hectic efforts, about 21% of the irrigated area is affected by different levels of salinity. The country has introduced numerous laws and regulations for the sustainable use and management of groundwater resources, but the success has so far been limited. Besides less respect for the law, unavailability of needed data and information, lack of political will and institutional arrangements are the primary reasons for poor groundwater management. Pakistan needs to revisit its strategies to make them adaptable to local conditions. An integrated water resource management approach that brings together relevant government departments, political leadership, knowledge institutions, and other stakeholders could be an attractive option.

scholarly journals Groundwater-abstraction induced land subsidence and groundwater regulation in the North China Plain

2015 ◽  
Vol 372 ◽  
pp. 17-21 ◽  
Author(s):  
H. Guo ◽  
L. Wang ◽  
G. Cheng ◽  
Z. Zhang
Keyword(s):  
Sustainable Development ◽  
Land Subsidence ◽  
North China Plain ◽  
North China ◽  
Groundwater Resources ◽  
Groundwater Abstraction ◽  
Beijing Plain ◽  
The North ◽  
The North China Plain ◽  
Development And Utilization

Abstract. Land subsidence can be induced when various factors such as geological, and hydrogeological conditions and intensive groundwater abstraction combine. The development and utilization of groundwater in the North China Plain (NCP) bring great benefits, and at the same time have led to a series of environmental and geological problems accompanying groundwater-level declines and land subsidence. Subsidence occurs commonly in the NCP and analyses show that multi-layer aquifer systems with deep confined aquifers and thick compressible clay layers are the key geological and hydrogeological conditions responsible for its development in this region. Groundwater overdraft results in aquifer-system compaction, resulting in subsidence. A calibrated, transient groundwater-flow numerical model of the Beijing plain portion of the NCP was developed using MODFLOW. According to available water supply and demand in Beijing plain, several groundwater regulation scenarios were designed. These different regulation scenarios were simulated with the groundwater model, and assessed using a multi-criteria fuzzy pattern recognition model. This approach is proven to be very useful for scientific analysis of sustainable development and utilization of groundwater resources. The evaluation results show that sustainable development of groundwater resources may be achieved in Beijing plain when various measures such as control of groundwater abstraction and increase of artificial recharge combine favourably.

scholarly journals Constructing a Method for an Evaluation Index System Based on Graph Distance Classification and Principal Component Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Keyou Shi ◽  
Yong Liu ◽  
Zhijun Zhang ◽  
Qing Yu ◽  
Qiucai Zhang
Keyword(s):  
Principal Component Analysis ◽  
Environmental Quality ◽  
Index System ◽  
Principal Component ◽  
Component Analysis ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Radiation Environment ◽  
Graph Distance ◽  
System A

Based on the importance of having an evaluation index system, a new method that combines PCA with graph distance classification is presented to make up the deficiencies of principal component analysis in the process of index screening, and this method is applied in the construction of an evaluation index system for the environmental quality of decommissioning uranium tailing. The seepage indexes were classified into six classes using graph distance classification, which selects the representative elements, including pH, ∑α, 210Pb, 210Po, F−, and NO3−. All of the representative elements were analyzed by PCA while determining the seepage indexes, including pH, U, Ra, ∑α, NH4-N, and F−, and establishing an index system for environmental quality evaluation that consists of two primary indexes (seepage and radiation environment) and 12 secondary indexes. The results showed that the model had ensured that the sifted indexes had a significant effect on the evaluation result and avoided the deletion of some important indexes and that it had stronger applicability and maneuverability.

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.

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