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

3D modelling of a hydrological structure combining spatial data science and geophysics: Application to a coastal aquifer system in the island of Crete, Greece

2021 ◽  
Author(s):  
Emmanouil Varouchakis ◽  
Leonardo Azevedo ◽  
João L. Pereira ◽  
Ioannis Trichakis ◽  
George P. Karatzas ◽  
...  
Keyword(s):  
Climate Change ◽  
Groundwater Flow ◽  
Spatial Data ◽  
Coastal Aquifer ◽  
Data Science ◽  
Flow Model ◽  
Groundwater Resources ◽  
Geostatistical Simulation ◽  
Groundwater Flow Model ◽  
Aquifer System

<p>Groundwater resources in Mediterranean coastal aquifers are under threat due to overexploitation and climate change impacts, resulting in saltwater intrusion. This situation is deteriorated by the absence of sustainable groundwater resources management plans. Efficient management and monitoring of groundwater systems requires interpreting all sources of available data. This work aims at the development of a set of plausible 3D geological models combining 2D geophysical profiles, spatial data analytics and geostatistical simulation techniques. The resulting set of models represents possible scenarios of the structure of the coastal aquifer system under investigation. Inverted resistivity profiles, along with borehole data, are explored using spatial data science techniques to identify regions associated with higher uncertainty. Relevant parts of the profiles will be used to generate 3D models after detailed Anisotropy and variogram analysis. Multidimensional statistical techniques are then used to select representative models of the true subsurface while exploring the uncertainty space. The resulting models will help to identify primary gaps in existing knowledge about the groundwater system and to optimize the groundwater monitoring network. A comparison with a numerical groundwater flow model will identify similarities and differences and it will be used to develop a typical hydrogeological model, which will aid the management and monitoring of the area's groundwater resources. This work will help the development of a reliable groundwater flow model to investigate future groundwater level fluctuations at the study area under climate change scenarios.</p><p> </p><p>This work was developed under the scope of the InTheMED project. InTheMED is part of the PRIMA programme supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement No 1923.</p>

scholarly journals Hidrostratigrafi Akuifer sebagai Geoindikator Genesis Bentuk Lahan di Wilayah Kepesisiran Kabupaten Kulonprogo, Daerah Istimewa Yogyakarta

2012 ◽  
Vol 26 (2) ◽  
pp. 160 ◽  
Author(s):  
Langgeng Wahyu Santosa
Keyword(s):  
Research Method ◽  
Research Area ◽  
Unconfined Aquifer ◽  
Typical Characteristic ◽  
The Holocene ◽  
Aquifer System ◽  
Second Stage ◽  
The Past ◽  
Third Stage ◽  
Geomorphological Processes

Purpose of this research is to study on aquifer hydrostratigraphy that can be a geo-indicator of geomorphological processes on the past, that describe of landform genetic in the research area. The research method is survey. The framework of analysis in this research is landform genetic. The results of the research indicate that: (1) "the forming of aquifer hydrostratigraphy in the research area is controlled by some of main processes in geomorphology, that show of landform genetic specifically". The research area consists of 3 aquifer hydrostratigraphy systems, each of the aquifer system has the typical characteristic, showed by system and pattern of material stratigraphy in the aquifer and variation of groundwater characteristic in the unconfined aquifer. (2) "spatiotemporally, landform genetic in the research area influences on the forming of aquifer hydrostratigraphy in the 3 phases, i.e. the first stage at the end of the Tertiary epoch (end of Pliocene era), second stage at the Quaternary epoch (as long as the Pleistocene period), and third stage at the Holocene era". The genesis and chronology of landform forming in the 3 phases above influence on the forming of system and pattern of aquifer hydrostratigraphy in the research area.

Evaluation of Shallow Groundwater Quantity in Harbin by Numerical Modeling

2011 ◽  
Vol 255-260 ◽  
pp. 2745-2750
Author(s):  
Chang Lei Dai ◽  
Zhi Jun Li ◽  
Shao Min Du ◽  
Chun He Liu
Keyword(s):  
Numerical Modeling ◽  
Groundwater Modeling ◽  
Groundwater Resources ◽  
Shallow Groundwater ◽  
System Structure ◽  
Shallow Aquifer ◽  
Hydrogeological Model ◽  
Aquifer System ◽  
Structure Boundary ◽  
Groundwater Quantity

In order to complete the geological survey of Harbin, it is necessary to understand the regime and law of groundwater in Harbin with the method of groundwater numerical modeling which requires the evaluation of groundwater resources quantity as a basic and critical step. Based on the analysis of hydrogeological conditions of the shallow aquifer in Harbin which includes the characteristics of aquifer system structure, boundary conditions, groundwater regime and recharge and discharge, a conceptual hydrogeological model has been built up with GMS (Groundwater Modeling System). With the numerical simulation model transferred by the conceptual model, the total amounts of renewable groundwater resources under different precipitation frequencies have been calculated. The result not only illustrates that the shallow aquifer in Harbin has certain potential in development and utilization but also provides some reference for managing a highly precise groundwater quantity evaluation by groundwater numerical modeling techniques.

Groundwater budget deficit caused by drought and overexploitation

2019 ◽  
Vol 20 (2) ◽  
pp. 621-632
Author(s):  
Mahdi Soleimani-Motlagh ◽  
Hoda Ghasemieh ◽  
Ali Talebi ◽  
Khodayar Abdollahi ◽  
Walter Dragoni
Keyword(s):  
Budget Deficit ◽  
Unconfined Aquifer ◽  
Groundwater Model ◽  
Aquifer System ◽  
Relative Contribution ◽  
Model Predictions ◽  
The World ◽  
Groundwater Overexploitation ◽  
Groundwater Budget ◽  
Semi Arid

Abstract Groundwater is generally influenced by overexploitation and climatic stresses particularly in arid and semi-arid areas of the world. The present research was conducted to identify the relative contribution of drought and overexploitation to groundwater budget deficit in an unconfined aquifer system. In order to simulate groundwater, the simulated recharge from WetSpass-M model was applied in the MODFLOW model along with other required packages. Moreover, the groundwater budget deficit caused by stressors was quantified through the use of calibrated groundwater model predictions. In order to better understand how the stressors affect the groundwater deficit, the aquifer was divided into Clusters 1, 2, and 3. Locally, the results showed that the contribution of stressors to groundwater budget deficit was the highest in Cluster 1 due to the groundwater overexploitation and quick reaction of the groundwater level to the droughts. Overall, this research showed that both drought and overexploitation, with an average of 2.44 and 3.32 million cubic meters, respectively, played a significant role in groundwater storage deficit. Furthermore, the effect of groundwater overexploitation was approximately 36% more than droughts.

scholarly journals GRANULAR AQUIFER SYSTEM OF WEST CHALKIDIKI AREA, REGION OF CENTRAL MACEDONIA, NORTHERN GREECE

2017 ◽  
Vol 50 (2) ◽  
pp. 1016
Author(s):  
N. Veranis ◽  
M. Nimfopoulos ◽  
C. Christidis ◽  
A. Chrysafi
Keyword(s):  
Groundwater Resources ◽  
Groundwater Table ◽  
Quaternary Sediments ◽  
Efficient Utilization ◽  
Northern Greece ◽  
Aquifer System ◽  
Piezometric Surface ◽  
Hydrogeochemical Characterization ◽  
Granular Aquifer

The granular aquifer system of the western Chalkidiki peninsula covers an area of 667 Km2 occupying Neogene and Quaternary sediments. The present study deals with the hydrogeological and hydrogeochemical characterization of the granular aquifer system for the purposes of efficient utilization and management of groundwater resources. It is a multilayered formation, composed of unconsolidated to semi-consolidated sands, gravels, conglomerates, sandstones and marly limestones with intercalated impermeable to semi-permeable beds of clays, marls or mixed with pebbles and sands. The aquifer system is characterized by medium to moderate hydrocapacity and the pumped groundwater consumptions are 74*106 m3/yr. Piezometric studies carried out in the period of 2003-14, conclude that the piezometric surface decline is located in the S and SE parts of the aquifer system, while in the rest Central and NW parts there is a noticeable rising of the groundwater table. Groundwater is generally characterized by a good quality; however, groundwaters of the broader Triglia area, have excessively high contents of As (10 to 3400 μgr/l) and B (1.5 to 4.0 mg/l). Other natural pollutants are Fe and Mn. Salinization and high values of nitrate are mainly detected in water boreholes of Moudania-Portaria, Akrotiri-Epanomi and Agelochori areas.

scholarly journals Modelling seawater intrusion in the Pingtung coastal aquifer in Taiwan, under the influence of sea-level rise and changing abstraction regime

2020 ◽  
Vol 28 (6) ◽  
pp. 2085-2103 ◽  
Author(s):  
Mahdieh Dibaj ◽  
Akbar A. Javadi ◽  
Mohammad Akrami ◽  
Kai-Yuan Ke ◽  
Raziyeh Farmani ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Sea Level Rise ◽  
Sea Level ◽  
Seawater Intrusion ◽  
Coastal Aquifer ◽  
Groundwater Resources ◽  
Element Model ◽  
Aquifer System ◽  
Pingtung Plain

Abstract A three-dimensional variable-density finite element model was developed to study the combined effects of overabstraction and seawater intrusion in the Pingtung Plain coastal aquifer system in Taiwan. The model was generated in different layers to represent the three aquifers and two aquitards. Twenty-five multilayer pumping wells were assigned to abstract the groundwater, in addition to 95 observation wells to monitor the groundwater level. The analysis was carried out for a period of 8 years (2008–2015 inclusive). Hydraulic head, soil permeability, and precipitation were assigned as input data together with the pumping records in different layers of the aquifer. The developed numerical model was calibrated against the observed head archives and the calibrated model was used to predict the inland encroachment of seawater in different layers of the aquifer. The effects of pumping rate, sea-level rise, and relocation of wells on seawater intrusion were examined. The results show that all layers of the aquifer system are affected by seawater intrusion; however, the lengths of inland encroachment in the top and bottom aquifers are greater compared with the middle layer. This is the first large-scale finite-element model of the Pingtung Plain, which can be used by decision-makers for sustainable management of groundwater resources and cognizance of seawater intrusion in coastal aquifers.

scholarly journals PENGELOLAAN AIR TANAH DAN INTRUSI AIR LAUT

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Arie Herlambang ◽  
Robertus Haryoto Indriatmoko
Keyword(s):  
Fresh Water ◽  
Sea Water ◽  
Model Simulation ◽  
Groundwater Resources ◽  
Three Dimensions ◽  
Three Dimension ◽  
Groundwater Model ◽  
Confined Aquifer ◽  
Aquifer System ◽  
Simulation And Optimization

Coastal Aquifer System of Jakarta consist of unconfined aquifer layers, confined aquifer I and  confined aquifer II.  Resources of  groundwater is very important for Jakarta City, for drinking water, industry, hotel, government offices and various other facility. Important considering of    groundwater resources of Jakarta hence needed an effort to preserve the groundwater and awake its continuity by conducting a system management of groundwater. Model used for the management of groundwater system of aquifer coastal referred as Groundwater Model Simulation and Optimization of Quasi Three Dimension ( OPT-Q3D). Model simulation and optimization represent computer model of quasi-three dimensions with method of finite difference used for the operation of infiltration of sea water. This model can conduct current simulation of groundwater flow, head of fresh water and brine, and describe the movement of interface fresh water and sea water. The model can also make optimization of system aquifer with single or multi layers.  Jakarta Groundwater Basin assumed consist three layers of aquifer separated by impermeable layer. Applying of groundwater simulation model in Jakarta can give information regarding balance of groundwater, head of freshwater, head of  brine, interface brine and freshwater, map of brine distribution and bargain in each; every aquifer. Herein after model optimization will yield various information able to wear upon which consideration to manage the amount of pumping of optimal ground water every area in each layer of aquifer, amount of optimal pumping, optimal freshwater head, head of optimal brine and map of infiltration.  Kata Kunci  : Air Tanah, Pengelolaan, Intrusi Air Laut, Modeling

scholarly journals The Investigation of Groundwater Potential by Vertical Electrical Sounding (VES) Approach in Arguni Bay Region, Kaimana Regency, West Papua

2016 ◽  
Vol 21 (1) ◽  
Author(s):  
Langgeng Wahyu Santosa ◽  
Tjahyo Nugroho Adji
Keyword(s):  
Groundwater Resources ◽  
Electrode Array ◽  
Research Area ◽  
Groundwater Potential ◽  
Fractured Aquifer ◽  
Resistivity Sounding ◽  
Aquifer System ◽  
West Papua ◽  
Electrical Sounding ◽  
Slope Direction

This research was conducted within some villages in the surrounding area that administratively including Arguni Bay District, Kaimana Regency, West Papua. The main objective of this study is to vertically measure resistivity value of aquifer with the intention of recognizing deep groundwater potency as a source of native’s domestic needs. In addition, VES method by Schlumberger electrode array was applied within 18 locations, which expectantly represent the whole area of research. The resistivity data is then interpreted by IP2Win 2.1 Geoelectric Software to entirely describe the aquifer system as well as the occurrence of groundwater. The result indicates that vertically, the aquifer system is dominated by interbedded of claystone and sandstone (argillite group) as a past marine environment mineral. In addition, geomorphological and resistivity sounding interpretation gives a viewpoint that the landforms of the research area may be typified as Structural Mountain with the slope direction is towards the island beaches. Also, structurally, the main groundwater system is fractured aquifer with very limited productivity of groundwater resources. As consequences, this aquifer is more to be an aquitard, rather than an aquifer.

scholarly journals Ketersediaan dan Kualitas Airtanah pada Akuifer Tidak Tertekan Di Kecamatan Jawilan dan Kopo, Kabupaten Serang

2019 ◽  
Vol 33 (1) ◽  
pp. 16 ◽  
Author(s):  
Setyawan Purnama
Keyword(s):  
Groundwater Quality ◽  
Research Area ◽  
Unconfined Aquifer ◽  
Specific Yield ◽  
Groundwater Exploitation ◽  
Safe Yield ◽  
Aquifer System ◽  
Groundwater Availability ◽  
Groundwater Fluctuation ◽  
Dug Well

Tujuan dari penelitian ini adalah (1) mengetahui sistem akuifer di daerah penelitian, (2) menghitung ketersediaan airtanah pada akuifer tidak tertekan dan (3) menganalisis kualitas airtanahnya. Sistem akuifer diketahui dengan melakukan interpretasi data geolistrik. Potensi akuifer tidak tertekan dihitung secara kualitatif melalui skoring dan tumpang susun antara Peta Kedalaman Muka Airtanah, Peta Fluktuasi Airtanah dan Peta Kualitas Airtanah. Volume akuifer ditentukan berdasarkan perkalian antara luas wilayah masing-masing potensi dan tebal akuifer. Ketersediaan airtanah dihitung berdasarkan asumsi aliran airtanah statik, sedangkan hasil aman pengambilan airtanah ditentukan berdasarkan parameter fluktuasi airtanah, luas akuifer dan spesifik yield. Kualitas air dianalisis berdasarkan pengambilan sampel air pada sumur gali. Hasil penelitian menunjukkan bahwa di daerah penelitian ditemukan adanya akuifer semi tertekan dan akuifer tidak tertekan. Ditinjau dari potensinya, ketersediaan airtanah pada akuifer tidak tertekan sebesar 1.205.967.345 m3, dengan hasil aman pengambilan airtanah sebesar  54.585.307 m3/tahun. Untuk kualitas air, secara umum baik, meskipun beberapa parameter seperti kalsium, magnesium, mangan dan COD kadarnya telah melampaui baku mutu  di beberapa sampel.ABSTRACT The objectives of the research are (1) knowing the aquifer system in research area, (2) calculate groundwater availability in unconfined aquifer and (3) analysis the groundwater quality. Aquifer system is known by interpretation of geoelectric data. Groundwater potency is calculated qualitatively by scoring and overlay of Groundwater Depth Map, Groundwater Fluctuation Map and Groundwater Quality Map. Aquifer volume is calculated by multiplied area width of each potency and aquifer thickness. Amount of groundwater is calculated base on static groundwater flow assumption, whereas safe yield of groundwater exploitation is determined base on parametre groundwater fluctuation, aquifer width and specific yield. Groundwater quality are analized by groundwater samples that taken from dug well. Result of research show that there are two aquifer type in research area i.e. semi confined aquifer and unconfined aquifer. The potency of unconfined aquifer is 1.205.967.345 m3, with safe yield 54.585.307 m3/year. For groundwater quality, generally good, although some parameters have concentration exceeded the standard in some samples such as calcium, magnesium, manganese and COD.

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