scholarly journals Estimating the groundwater storage for future irrigation schemes

2021 ◽  
Author(s):  
Shaibu Abdul-Ganiyu ◽  
Kpiebaya Prosper
Keyword(s):  
Storage Capacity ◽  
Pumping Test ◽  
Groundwater Depth ◽  
Northern Ghana ◽  
Test Results ◽  
Groundwater Storage ◽  
Groundwater Occurrence ◽  
Static Water ◽  
Agricultural Use ◽  
Electrical Data

Abstract Presented in this paper is a feasibility study of groundwater for agricultural use (irrigation) in Northern Ghana. The study was conducted using Geo-electrical data, Boreholes drill logs, results of water quality, and results of the pumping test. The geo-electrical results were to unearth the lithology of the study area; it was found to be underlain with varying geology of both Precambrian and Paleozoic sedimentary formation. These formations consist of phyllite, schist, granite, meta-sediments, and meta-volcanics making up the Precambrian and sandstone, shale, siltstone, mudstones, granitiods also, of the Paleozoic sedimentary. Areas of low resistivity were targeted for drilling per the geophysical results of the profile, values between 24 and 100 ohm.m were zones of probable groundwater occurrence in the study. The groundwater storage capacity and the extractable storage capacity were estimated to be approximately 710,000 km3 and 290,000 km3. The pumping test results acquired from 81 boreholes from the study were used to analyze the sustainability and otherwise. However, groundwater depth was studied using the Static water level (SWL), areas of SWL around 22 m and 25 m are likely to have a shallow depth whereas areas of 17 m would have deeper groundwater depth.

Numerical Simulation Study on Three-Dimensional Seepage Field of Deep Excavation Dewatering in Thick Aquifer

2013 ◽  
Vol 353-356 ◽  
pp. 1305-1309
Author(s):  
Yan Jun Liu ◽  
Li Zhen Shen
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Three Dimensional ◽  
Pumping Test ◽  
Calculation Model ◽  
Test Results ◽  
Deep Excavation ◽  
Test Procedures ◽  
Hydrogeological Parameters ◽  
Geological Conditions

This article describes the pumping test procedures and test results of the subway project 30m deep excavation dewatering in thick aquifer. A groundwater three-dimensional seepage numerical calculation model is established. We use the model to calculate and compare the calculated results and the actual results, obtain hydrogeological parameters by inversion. Further, we have a numerical simulation study on deep excavation dewatering with the hydrogeological parameters, the Simulation results and excavation pre-dewatering test results are consistent. Test results show that the model can reflect the deep excavation dewatering process with complex geological conditions.

A Method To Account for Afterflow at the Pulsing Well During Pulse Tests

1983 ◽  
Vol 23 (03) ◽  
pp. 519-520
Author(s):  
Hubert Winston
Keyword(s):  
Computer Simulations ◽  
Flow Rate ◽  
Storage Capacity ◽  
Pulse Length ◽  
Test Area ◽  
Pilot Test ◽  
Test Results ◽  
Pulse Test ◽  
Wellbore Storage ◽  
And Storage

Abstract The nature of wellbore storage is such that afterflow during a pulse test can affect the reservoir pressure performance and can lead to the calculation of erroneous performance and can lead to the calculation of erroneous values for formation transmissibility and storage. This is most likely to occur when the wells of interest are close together or when after flow persists for a long time relative to the pulse length. This article describes a technique that was developed to account for the effects of after flow at the pulsing well during pulse testing of a small production pilot. The technique is not general because it requires that a computer-generated simulation of each pulse test be made. An application of the method is given. Introduction In carrying out a pulse test, we introduce a pressure disturbance into a reservoir by alternately increasing and decreasing the flow rate at the pulsing well in a known manner. The pressure at the responding well is monitored, and, if the wells are in pressure communication, the pressure distrubance eventually will affect the pressure at the responding well. Since the form and the duration of the flow, rate disturbance are known, and since the mathematics that describe the pressure behavior of fluid-beefing reservoirs are well understood, the pulse test pressure response can be predicted. Several methods are available to calculate values for formation transmissibility and storage within a pulse-tested reservoir. Although all real reservoirs are heterogeneous, the models for deriving these techniques assume that the reservoir is ideal. When the wells of interest are far apart or when the duration of after flow is short relative to the pulse length, the effects of wellbore storage on the pulse test results will be slight. If, on the other hand, the pulsing well and the responding well are close together or if after flow persists for a tong time, the effects of wellbore storage on the pulse test results may be substantial. The work described here began during the analysis phase of a series of pulse tests that were run in a small phase of a series of pulse tests that were run in a small pilot test area. Computer simulations of the tests showed pilot test area. Computer simulations of the tests showed that the method of Mondragon and Menzie would not compensate adequately for the strong effects of after flow on test results. Description of the Method Since a series of injection/falloff tests had been run in the pilot area, it was possible to obtain values for the ratio of formation transmissibility to the wellbore storage capacity, /F, at each well by type-curve matching techniques. Using this parameter, we can determine the after flow vs. time profiles that would occur during the pulsing-well shut-in periods and incorporate them into a computer simulation of each pulse test. A typical pulsing well-flow profile showing after flow during the shut-in period is profile showing after flow during the shut-in period is illustrated in Fig. 1. Given that the pulsing wells were observed to go on vacuum soon after shut-in and given that the wellbore storage capacity for these wells during the on-vacuum condition should be approximately two orders of magnitude larger than it would be during injection SPEJ p. 519

scholarly journals Simulation of the Spatial Distribution of Hydraulic Conductivity in Porous Media through Different Methods

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Zengguang Xu ◽  
Xue Wang ◽  
Junrui Chai ◽  
Yuan Qin ◽  
Yanlong Li
Keyword(s):  
Grain Size ◽  
Porous Media ◽  
Spatial Distribution ◽  
Hydraulic Conductivity ◽  
Pumping Test ◽  
Wide Area ◽  
Test Results ◽  
Seepage Field ◽  
Water Conservancy ◽  
Geological Research

Seepage problems exist in water conservancy projects, groundwater research, and geological research, and hydraulic conductivity is an important factor that affects the seepage field. This study investigates the heterogeneity of hydraulic conductivity. Kriging methods are used to simulate the spatial distribution of hydraulic conductivity, and the application of resistivity and grain size is used to obtain hydraulic conductivity. The results agree with the experimental pumping test results, which prove that the distribution of hydraulic conductivity can be obtained economically and efficiently and in a complex and wide area.

scholarly journals Groundwater storage changes and estimation of stream lateral seepage to groundwater in desert riparian forest region

2017 ◽  
Vol 49 (3) ◽  
pp. 861-877 ◽  
Author(s):  
Haiyang Xi ◽  
Qi Feng ◽  
Lu Zhang ◽  
Jianhua Si ◽  
Tengfei Yu
Keyword(s):  
River Basin ◽  
Field Experiments ◽  
Riparian Forest ◽  
Groundwater Depth ◽  
Heihe River ◽  
Groundwater Storage ◽  
Inland River ◽  
East River ◽  
Forest Region ◽  
Water Conveyance

Abstract Field experiments were conducted in the lower reaches of the Heihe River basin in the northwest of China to determine relationships between stream and groundwater and to quantify stream lateral seepage. The water table fluctuation, water balance and statistical analysis methods were used to analyze long-term experimental data. Results showed that the groundwater depth along the experimental section responded strongly to the streamflow of the East River in the basin. The streamflow of the East River in all periods significantly influenced the amplitude of groundwater depth within the range of 300 m from the riverbank; the stream lateral seepage was mainly controlled by the streamflow and its durations. The evapotranspiration of riparian forest had used larger proportions of groundwater storage in summer, close to approximating 60%. This study quantified stream lateral seepage to groundwater for different water conveyance and provides support for regional water resources management in an arid inland river basin.

scholarly journals Quantifying streamflow and active groundwater storage in response to climate warming in an alpine catchment on the Tibetan Plateau

2018 ◽  
Author(s):  
Lu Lin ◽  
Man Gao ◽  
Jintao Liu ◽  
Xi Chen ◽  
Hu Liu
Keyword(s):  
Tibetan Plateau ◽  
Climate Warming ◽  
Storage Capacity ◽  
Flow Analysis ◽  
Summer Rainfall ◽  
Dominant Factor ◽  
The Tibetan Plateau ◽  
Early Winter ◽  
Frozen Ground ◽  
Groundwater Storage

Abstract. Climate warming is changing streamflow regimes and groundwater storage in cold alpine regions. In this study, a headwater catchment named Yangbajain in the Lhasa River basin on the Tibetan Plateau is adopted as the study area for quantifying streamflow changes and active groundwater storage in response to climate warming. The catchment is characterized by alpine glacier and frozen ground which covers about 11 % and 86 % of the total area, respectively. The changes in streamflow regimes (including quickflow and baseflow) and climate factors are evaluated based on hydro-meteorological observations from 1979 to 2013. Then active groundwater storage in autumn and early winter is quantified by recession flow analysis assuming nonlinearized outflow from aquifers into streams. The results show that annual streamflow increases significantly at a rate of about 12.30 mm/10a during this period. The significant increase of annual air temperature compared with nonsignificant variation of annual precipitation indicates that the climate warming takes responsibilities to the increase of streamflow. It is believed that the increased streamflow is mainly fed by glacier meltwater, which has led to over 25 % loss of the total glacial volume in the past 50 years (1960–2009) in this catchment. Moreover, the significant increase of annual baseflow at a rate of about 10.95 mm/10a is the dominant factor for the increase of the total streamflow. Through recession flow analysis, we find that recession coefficient K and active groundwater storage S in autumn and early winter increase significantly at the rates of about 7.70 (mm0.79d−0.21)/10a and 19.32 mm/10a during these years. The increase of active groundwater storage can partly be explained by frozen ground degradation, which lead to the enlargement of groundwater storage capacity and accommodate more summer rainfall and meltwater in the wide and flat valley, and then slowly release them into streams in the following seasons. Thus, it is reasonable to attribute the increase of baseflow and the slowdown of baseflow recession process in autumn and early winter to the enlargement of groundwater storage capacity. Through quantifying streamflow changes and active groundwater storage in response to warming-induced changes, this study provides a perspective to clarify the way of glacial retreat and frozen ground degradation on hydrological processes.

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