scholarly journals The Effectiveness of Wenner-Schlumberger and Dipole-dipole Array of 2D Geoelectrical Survey to Detect The Occurring of Groundwater in the Gunung Kidul Karst Aquifer System, Yogyakarta, Indonesia

2016 ◽  
Vol 1 (2) ◽  
pp. 71 ◽  
Author(s):  
Oktanius Richard Hermawan ◽  
Doni Prakasa Eka Putra
Keyword(s):  
Karst Aquifer ◽  
Groundwater Exploration ◽  
Karst Area ◽  
Karst Terrain ◽  
Aquifer System ◽  
Crystalline Limestone ◽  
Karst Aquifer System ◽  
Dipole Configuration ◽  
Underground River ◽  
Water Saturated

Until today, geoelectrical survey is the most effective method for groundwater exploration. 2D method or known as horizontal profiling is now the most appropriate method in the geoelectrical survey compare to vertical electrical sounding method. The 2D method of Wenner-Schlumberger and Dipole-dipole configuration proved to be very effective to locate conventional aquifer occurrence on volcanic terrain or sedimentary terrain. Karst aquifer system is an unconventional aquifer and acts very differ in contrast with the conventional sedimentary aquifer. Heterogeneity and discontinuity of limestones in karst terrain will reveal a wide variety of resistivities, hence it is difficult to interpret. This research has important objective to define the effectiveness of the Wenner-Schlumberger and Dipole-dipole configuration in the 2D geoelectrical survey to explore groundwater in the karst area. Field observation of geology and 2D geoelectrical survey were conducted in underground river of Kali Suci Area, Gunung Kidul. In Kali Suci where an endokarst cave was occured on the surface, line survey was placed in the top of the cave and across the geometry of the cave. Measured stratigraphy in the wall of the cave found four types of limestone which consist of packstone, wackestone, grainstone and crystalline limestone. The Wenner-Schlumberger and Dipole-dipole method can detect differentiation of limestone types and also the exposed underground river successfully. However, compared to Wenner-Schlumberger array, Dipole-dipole array reveals less vertical accuration.. Therefore, on this research, the best method to detect water saturated zone or gourndwater in the karst system is the Wenner-Schlumberger method.

The Forecasting of Tunnel Water Inflow in Bare Karst Area

2014 ◽  
Vol 1065-1069 ◽  
pp. 397-401
Author(s):  
Ya Zun Wu ◽  
Jun Wei Wan
Keyword(s):  
Karst Aquifer ◽  
Water Inflow ◽  
Karst Area ◽  
Observation Data ◽  
Antecedent Rainfall ◽  
Aquifer System ◽  
Karst Areas ◽  
Karst Aquifer System ◽  
Infiltration Recharge ◽  
Main Factor

Rainfall is the main factor that affecting water inflow of the tunnel in the bare karst areas of Southwest China. Affected by the development of karst aquifer system, rainfall infiltration recharge for groundwater has obvious lag time. The water inflow of tunnel is not only concerned with the intraday rainfall, but also related with the antecedent rainfall. In this paper, taking the Yesanguan Tunnel and Maluqing Tunnel as examples, the correlation between rainfall in different periods and water inflow was analyzed, and then the regression equation was established to forecast water inflow. The results show the predicted result is affect by the precision of the observation data, the development degree of karst, the infiltration and the discharge conditions of rainfall. Meanwhile, the correlation analysis is not suitable for some cases, such as the area which has greater changes of groundwater recharge and discharge under different rainfall conditions.

scholarly journals Simulation of solute transport behaviors in saturated karst aquifer system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xuewei Chu ◽  
Hanghang Ding ◽  
Xuemei Zhang
Keyword(s):  
Solute Transport ◽  
Karst Aquifer ◽  
Dynamic Responses ◽  
Karst Area ◽  
Initial Time ◽  
Peak Time ◽  
Tracer Transport ◽  
Tracer Injection ◽  
Aquifer System ◽  
Karst Aquifer System

AbstractThe karst development makes aquifer have strong anisotropy and heterogeneity. In order to reveal the characteristics of solute transport in the karst fissure–conduit aquifer system, this study presents a physical model of fissure–conduit in laboratory experiments to carry out the solute transport simulation. In this paper, the tracer tests of fissure–conduit combination, fissure, and conduit solute transport process in saturated flow are designed. We found that different aquifer structures and tracer injection points have an influence on the shape of the breakthrough curve. Besides, the two-dimensional dispersion model of tracer injection of the instantaneous point was used to calculate the dispersion parameters of each group of experiments. Then, the dynamic responses of the linear distance (x) between the injection point and the receiving point, initial time (t0), peak time (tm), peak concentration (cm), average tracer transport velocity (V), and porosity (p) of aqueous media to the longitudinal dispersion coefficient are discussed. In addition, according to the measured data, Gaussian multi-peak fitting can be used to reflect the overall shape and change trend of the multi-peak BTC. These results demonstrate the solute transport behaviors in the saturated karst aquifer system, which have important reference significance for solving the engineering environmental problems in the karst area.

Modeling the groundwater recharge in karst aquifers by using a reservoir model

2013 ◽  
Vol 68 (2) ◽  
pp. 406-412 ◽  
Author(s):  
Tingting Ke ◽  
Longcang Shu ◽  
Xunhong Chen
Keyword(s):  
Groundwater Recharge ◽  
Karst Aquifer ◽  
Threshold Function ◽  
Water Volume ◽  
Spring Hydrograph ◽  
Aquifer System ◽  
Linear Threshold ◽  
Important Challenge ◽  
Karst Aquifer System ◽  
Underground River

The estimation of the groundwater recharge in a karstic system becomes an important challenge due to the great hydrodynamic variability in both time and space. This paper proposes a two reservoir conceptual model to simulate inflow into both the conduit system and the fissure network system based on the analysis of the spring hydrograph. The structure of the model and the governing equations are proposed on the basis of the physical considerations, with the assumption that flow at the outlet of the reservoirs obeys a linear threshold function. The model is applied on the Houzhai karstic underground river basin where it successfully reflects the temporal recharge distribution. The simulated accumulation recharge is 34.29 mm, which is reasonable in relation to the actual rainfall of 92.8 mm. The variations of water volume in two reservoirs represent the storage and transform characteristics of the karst aquifer system. However, this model is particularly well suited to simulate the recharge event after intensive rainfall.

scholarly journals Simulation of Regional Karst Aquifer System and Assessment of Groundwater Resources in Manatí-Vega Baja, Puerto Rico

2015 ◽  
Vol 07 (12) ◽  
pp. 909-922 ◽  
Author(s):  
Balati Maihemuti ◽  
Reza Ghasemizadeh ◽  
Xue Yu ◽  
Ingrid Padilla ◽  
Akram N. Alshawabkeh
Keyword(s):  
Puerto Rico ◽  
Groundwater Resources ◽  
Karst Aquifer ◽  
Aquifer System ◽  
Karst Aquifer System ◽  
Vega Baja

scholarly journals Hydrogeological map of the Dinaric Karst Aquifer System

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
Adriatic Sea ◽  
Karst Aquifer ◽  
High Quality ◽  
Dinaric Karst ◽  
Resources Management ◽  
Aquifer System ◽  
Ne Italy ◽  
Aquifer Systems ◽  
Hydrogeological Map ◽  
Karst Aquifer System

Groundwaters of the Dinaric Karst form some of the world's largest karst aquifer systems. The Dinaric region contains huge amounts of high quality groundwater. It is one of the major contributors of freshwater entering the Adriatic Sea. The Dinaric Karst Aquifer System extends from NE Italy through Slovenia, Croatia, Bosnia & Herzegovina, Montenegro to Albania. Karst formations connected with the Dinaric carbonate chain outcrop also in Serbia, FYR Macedonia, and possibly in NW Greece. In the framework of the DIKTAS GEF-project (2010-2014) executed by UNESCO-IHP, the four DIKTAS project countries (Albania, Bosnia and Herzegovina, Croatia and Montenegro) have agreed to create two mechanisms in order to facilitate enhanced consultation and exchange of information between the governmental entities that are involved in water resources management. Groundwater Karst Transboundary

scholarly journals Analysis of Hydrogeochemical Characteristics of Tunnel Groundwater Based on Multivariate Statistical Technology

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Chen Peng ◽  
Yuanming Liu ◽  
Huiyu Chen ◽  
Qiaowei Yuan ◽  
Qingzhi Chen ◽  
...  
Keyword(s):  
Saturation Index ◽  
Karst Aquifer ◽  
Principal Component ◽  
Geological Structure ◽  
Chemical Components ◽  
Multivariate Statistical ◽  
Tunnel Excavation ◽  
Aquifer System ◽  
Karst Aquifer System ◽  
Natural Water Bodies

Following tunnel excavation, which is influenced by hydraulic fracturing and geological structure, a series of hydrochemical reactions occur in the karst aquifer, which has a significant impact on groundwater hydrology and the earth process. Based on five sets of 38 samples collected in the Tongzi Tunnel in 2020 and 2021, the main geochemical processes and water quality conditions of the karst aquifer system during tunnel construction were revealed by multivariate statistical analysis and graphical methods. The results showed that water-rock action is the main mechanism controlling groundwater chemistry in the study area; HCO3-, Ca2+, and Mg2+ are associated with the widely distributed carbonate rocks in the study area. SO42- is derived from gypsum and sulfate rocks and special strata, which are another important source of Ca2+. Sodium-containing silicates and reverse cation exchange as the causal mechanisms of Na+ whereas F- is derived from fluorite. According to the mineral saturation index calculations, the dissolution and precipitation of minerals such as alum, gypsum, calcite, dolomite, and salt rock have an important influence on the main chemical components in water. The 38 samples were subjected to cluster analysis, and the results could be classified into seven categories. The representative clusters 1, 3, and 5 were selected for principal component analysis. Clusters 1 and 5 of groundwater represent weathering, dissolution, and ion exchange of carbonate and sulfate rocks and are closely related to the lithologic limestone, limestone intercalated with carbonaceous mudstone, carbonaceous mudstone, and coal-measure strata in the aquifer. Cluster 3 is dominated by upper surface river water and characterizes the geochemistry in natural water bodies dominated by the dissolution of carbonate, sulfate, and salt rocks. Finally, groundwater quality is mostly found in Class IV, with NO3- and F- being the main contaminants in the water.

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