scholarly journals Hydrostratigraphy And Aquifer Geometry In Palu Groundwater Basin, Central Sulawesi Province After Earthquake

2021 ◽  
Vol 17 (1) ◽  
pp. 25-38
Author(s):  
Derry Prasetya Putra Santosa ◽  
Mohamad Sapari Dwi Hadian ◽  
Zulfialdi Zakaria
Keyword(s):  
Groundwater Modeling ◽  
Bottom Layer ◽  
Unconfined Aquifer ◽  
Basin Modeling ◽  
Current State ◽  
Distance Weighting ◽  
Aquifer Geometry ◽  
Groundwater Basin ◽  
Coastal Deposits ◽  
Central Sulawesi

Palu Groundwater Basin can be assumed to have a post-earthquake deformation in 2018. To identify current state of Palu Groundwater Basin, modeling approach was conducted using GMS 10.4 (Groundwater Modeling System) with IDW (Inverse Distance Weighting), with the data used for the model was obtained from 41 boreholes. The results show that Palu Groundwater Basin aquifer geometry can be divided into 4 types. The unconfined aquifer consisting of Alluvium and Coastal Deposits (Qa) have an area 412,69 km², with 17,77 - 72.48 m thickness top layer have elevation 341 MSL (mean sea level) and bottom layer have elevation -2,29 MSL. Top aquitard consisting of Celebes Mollase of Sarasin and Sarasin (QTms) have an area 391,1 km² with 0.1 - 20,61 mm thickness top layer have elevation 268,52 MSL and the bottom of layer have elevation -20,06 MSL. Confined aquifer consisting of Celebes Mollase of Sarasin and Sarasin (QTms) have an area 351,98 km² with 20,58 - 86,51 m thickness top layer have elevation 268,42 MSL and bottom layer have elevation -40,67 msl. Bottom aquitard consisting of Granite and Granodiorite (Tmpi), Tinombo Formation (Tts), Metamorphic Complex (Km), Latimojong Formation (Kls) have an area 78,24 km² with 20,58 - 86,51 m thickness 3,01 - 4,1 m top layer have elevation 181,91 MSL and bottom layer have elevation -29,09 MSLKeywords: Groundwater, basin, modeling, geometry, aquifer

scholarly journals Hydrogeological Conceptual Model in the Middle of Randublatung Groundwater Basin

2021 ◽  
Vol 926 (1) ◽  
pp. 012078
Author(s):  
D L Setyaningsih ◽  
K D Setyawan ◽  
D P E Putra ◽  
Salahuddin
Keyword(s):  
Groundwater Flow ◽  
Conceptual Model ◽  
Unconfined Aquifer ◽  
Primary Data ◽  
Essential Information ◽  
Aquifer System ◽  
The North ◽  
Shallow Wells ◽  
Groundwater Basin ◽  
Constant Head

Abstract Randublatung groundwater basin is one of the groundwaters basins with massive utilization of groundwater pumping. However, the knowledge of the comprehensive hydrogeological system in this groundwater basin is limited, so this research aims to determine a comprehensive hydrogeological conceptual model of the Randublatung groundwater basin. The methodology was conducted by collecting secondary and primary data of deep and shallow wells to evaluate boundaries of pattern and direction of groundwater flow and develop the aquifer system’s geometry. The result shows that the groundwater flow boundaries are Grogol River in the west, Wado River in the East, Bengawan Solo river in the South as a river boundary, and Rembang Mountains in the North as a constant head boundary. Therefore, groundwater flows from the hills area to the Bengawan Solo River and the north as the river’s flow. Based on the log bor evaluation, the aquifer system of the study area consist of an unconfined aquifer with a maximum thickness of 20 m and three layers of confined aquifers with thickness vary between 8 to 60 m. the hydraulic conductivity of the aquifers depends on the aquifer’s lithology range from sand, gravel, limestone, and sandstone. This hydrogeological conceptual model provides essential information for numerical groundwater models in the middle of the Randublatung groundwater basin.

COASTAL AQUIFER GROUNDWATER MODELING IN THE SOUTHERN PART OF YOGYAKARTA AREA, INDONESIA

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Doung Rata ◽  
Doni Prakasa Eka Putra ◽  
Heru Hendrayana
Keyword(s):  
Coastal Aquifer ◽  
Groundwater Modeling ◽  
Groundwater Resources ◽  
Total Surface Area ◽  
Research Area ◽  
Unconfined Aquifer ◽  
Groundwater Table ◽  
Groundwater Model ◽  
The South ◽  
Aquifer System

Parangtritis beach, located in a coastal aquifer at the southern part of Yogyakarta Province, Indonesia is bounded by the Indian Ocean at the South, Opak River at the West, and Tertiary Limestone Rock to the East. Local land-use is predominantly agriculture, rice fields and settlements and the population is estimated to be 9,386 persons as per the 2012 census. The total surface area is estimated at 9.46 km2. The aims of this research were to understand the system of groundwater and to assess and predict saltwater intrusion by conducting a numerical groundwater model. Hydrological and hydrogeological data were collected directly from the field and from previous work for input into the model. The model simulates an unconfined aquifer system where the aquifer thickness varies from 30-40 meters. The material of the aquifer consists of sand varying from fine to coarse grain size and fine gravel with hydraulic conductivity values of 8.974 × 10−4, 1.794 × 10−3, and 1.337 × 10−3 m/s at the northern, central, and southern part of the research area, respectively. The maximum length of the saltwater interface was estimated at about 205.1 m laterally and 40 m vertically relative to the location of the groundwater table around 1m above sea level. Direction of groundwater flow is from north to south. Groundwater table elevation equals 5 m at the north and 0 m at the south with a hydraulic gradient estimated at about 2.45 × 10−3. As a result of a steady-state simulation as well as two cases of prediction for five and ten years in the future, it is determined that that the salinity of the surrounding environment is not potentially adverse to the groundwater quality in the study area. This is in part due to low population in this area and abundant groundwater resources, as well as the results of the groundwater model. Keywords: Coastal aquifer, numerical groundwater model, conceptual model, observed heads

scholarly journals 3D Inverse modeling of EM-LIN data to investigate coastal sinkholes in Quintana Roo Mexico

2018 ◽  
Author(s):  
Luis Eduardo Ochoa-Tinajero ◽  
Marco Antonio Perez-Flores ◽  
Almendra Villela y Mendoza
Keyword(s):  
Inverse Modeling ◽  
Groundwater Modeling ◽  
Anthropogenic Activities ◽  
Sustainable Use ◽  
Three Dimensional ◽  
Unconfined Aquifer ◽  
Quintana Roo ◽  
Southern Mexico ◽  
Magnetic Dipoles ◽  
Karst Systems

Abstract. In southern Mexico at the Yucatan Peninsula (YP), cities and towns are settled on a platform of calcareous sedimentary sequence which has originated a wide formation of sinkholes, underground rivers and caverns due of karst process. The anthropogenic activities threat the only source of fresh water supply which is located in a regional unconfined aquifer; there are not lakes and rivers. For sustainable use of these resources at the YP, it is required to develop mathematical tools to help the groundwater modeling. In order to determine the geometry of the aquifer as the positions of caves, sinkholes and underground rivers we have developed software to invert three-dimensional electromagnetic low-induction numbers (3D EM-LIN) data for a set of profiles at arbitrary angle. In this work we have explored with the aid of EM-LIN geophysical method, the Chac-Mool sinkhole system at the state of Quintana Roo, Mexico. We have performed inverse modeling in 3D using the EM-34 instrument for vertical and horizontal magnetic dipoles. The 3D inversion process gives us models that allow us to correlate the path of the underground rivers with the subsurface electrical resistivity. In this work we have shown that inverse modeling of EM-LIN data is necessary to explore and understand coastal karst systems.

The Study of Groundwater Modeling of Plain Area in Shiyang River Basin - I Groundwater System Conceptual Model Construction

2014 ◽  
Vol 937 ◽  
pp. 632-638
Author(s):  
Yu Fei Cheng ◽  
Yuan Hong Li ◽  
Xiang Quan Hu ◽  
Jun De Wang ◽  
Shu Chao Lu
Keyword(s):  
Groundwater Modeling ◽  
Model Simulation ◽  
3D Visualization ◽  
Three Dimensional ◽  
Equilibrium Composition ◽  
Unconfined Aquifer ◽  
Geological Structure ◽  
Large Area ◽  
Groundwater System ◽  
Hydrogeological Conditions

In order to construct the groundwater numerical simulation model, the study area was determined on the basis of the geological and hydrogeological conditions. Taking Feflow as operating platform, combining GIS with Surfer software, a study area of the structure of three-dimensional aquifer model was established, realizing the 3D visualization of a large area of the complex geological content. Combined with the hydrogeological conditions, three-dimensional geological structure of the model further generalization. The result showed that the aquifer of the vertical was generalized into the unconfined aquifer; based on the characteristics of lithology, structure, parameters and distribution of recharge and discharge in groundwater system, the study area groundwater system was characterized by isotropic saturated-unsaturated numerical flow model, and the equilibrium composition of the elements was analysed in study area, the partition of the aquifer hydrogeological parameters was divided, lay the foundation for groundwater numerical model simulation.

scholarly journals A Feasibility Assessment of Potential Artificial Recharge for Increasing Agricultural Areas in the Kerbala Desert in Iraq Using Numerical Groundwater Modeling

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3167
Author(s):  
Waqed H. Hassan ◽  
Basim K. Nile ◽  
Karrar Mahdi ◽  
Jan Wesseling ◽  
Coen Ritsema
Keyword(s):  
Groundwater Modeling ◽  
Artificial Recharge ◽  
Three Dimensional ◽  
Treatment Plant ◽  
Water Source ◽  
Unconfined Aquifer ◽  
Injection Wells ◽  
Groundwater Levels ◽  
Feasibility Assessment ◽  
Agricultural Areas

Groundwater in Iraq is considered to be an alternative water resource, especially for areas far away from surface water. Groundwater is affected by many factors including climate change, industrial activities, urbanization, and industrialization. In this study, the effect of artificial recharge on the quantity of groundwater in the Dibdibba unconfined aquifer in Iraq was simulated using a groundwater modeling system (GMS). The main raw water source used in the artificial recharge process was the reclaimed water output (tertiary treatment) from the main wastewater treatment plant (WWTP) in Kerbala, with 20 injection wells. After calibration and validation of the three-dimensional numerical model used in this study and taking wastewater recharge rates into account, two different scenarios were applied to obtain the expected behavior of the aquifer when the groundwater levels were augmented with 5% and 10% of the daily outflow production of the WWTP in Kerbala. The model matched the observed head elevations with R2 = 0.951 for steady state and R2= 0.894 for transient simulations. The results indicate that the injection of treated water through 20 wells raised the water table in more than 91 and 136 km2 for 5000 and 10,000 m3/day pumping rates, respectively. Moreover, increasing the volume of water added to the aquifer could lead to establishing new agricultural areas, spanning more than 62 km2, extending about 20 km along the river.

scholarly journals SEA WATER QUALITY OBSERVED FROM NUTRIENT ASPECT, DISSOLVED OXYGEN AND PH IN THE BANGGAI WATERS, CENTRAL SULAWESI

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Marojahan Simanjuntak
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Sea Water ◽  
Bottom Layer ◽  
Nutrient Concentrations ◽  
Phosphate Nitrate ◽  
Winkler Method ◽  
June July ◽  
Central Sulawesi ◽  
Oxygen Concentrations

<p>Banggai Waters, Central Sulawesi is very important because the waters is very rich in marine resources and its oceanographic  conditions are affected by land and Banda Sea. This research was conducted in June-July 2011 using a research vessel Baruna Jaya VIII. The research objective was to determine water quality based on as an indicator of fertility waters and factors influencing the water quality.  The parameters studied were phosphate, nitrate, silicate, dissolved oxygen, and acidity (pH). Water samples were collected using Niskin Bottle attached with CTD form three different depths i.e., surface (0-1 m), middle (20-100 m), and near bottom layer (100-200 m) at 14 stations.  Concentrations of phosphate, nitrate, and silicate were analyzed according to the method of Strickland and Parsons. Dissolved oxygen concentrations were measured by Winkler method. The degree of acidity (pH) was measured with pH meter Cyber ​​Scan 300. The results indicated that nutrient concentrations were generally higher in eastern and southern waters. Phosphate concentrations ranged from 0,04–1.70 µg A/l; nitrate 0.28–27.23 µg A/l, and silicate 1.96–46.56 µg A/l. Dissolved oxygen concentrations ranged from 2.14–4.15 ml/l, and pH values ​​from 7.95–8.26. In reference to the quality standards set by the Ministry of Environment (KMNLH), the Banggai Waters, Central Sulawesi is still in good conditions for the life of various biota..</p> <p>Keywords: water quality, fertility waters, nutrients, Banggai Waters</p>

scholarly journals Zonasi Potensi Airtanah Akuifer Bebas Di Cekungan Airtanah Majenang, Kabupaten Cilacap, Jawa Tengah

PROMINE ◽  
2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Mahira Anaqah Huwaina ◽  
Thomas Triadi Putranto ◽  
Narulita Santi
Keyword(s):  
Water Level ◽  
Water Table ◽  
Pumping Test ◽  
Unconfined Aquifer ◽  
Potential Zone ◽  
Central Java ◽  
A Value ◽  
Characteristic Data ◽  
Groundwater Basin ◽  
Medium Potential

Majenang Groundwater Basin is located in Cilacap Regency, Central Java. There is an increase of itsusage every year. Because of that, it is necessary to make groundwater zonation to get an overview ofthe potential zonation, specifically in unconfined aquifer. The methods used in this study is measuringwater table, sampling 17 samples of groundwater and pumping test to get the quantity of groundwater.Based on the measurement of known water table, it flows from the side of basin to the center of basin.It has a value of water level between 0.1-4.5 mbgl and water table 33.3-119.9 masl. Pumping test dataprocessing generates characteristic data aquifers, with value of transmisivity (T) is 2.9-11.3 m2/day,hidrolic conductivity (K) is 0.7-4.9 m/day, maximum debit is 2.3-3.6 L/day and optimum debit is 2.0-2.9L/day. Based on the result of quantity data, it has a medium potential zone for the unconfined aquifer.

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