Improving the characterization of Quaternary deposits for groundwater vulnerability assessments using maps of recharge and attenuation potential

Groundwater vulnerability to pollution refers to the ease with which pollutants reach groundwater, in other words indicating the level of ease of an area to experience pollution. At present, the theme is one of the themes that attracts many researchers because pollution is more frequent in an area. The purpose of this study is to assess groundwater vulnerability in the study area for pollution using the GOD method and conduct a study of 3 groundwater vulnerability assessments, to determine the most appropriate assessment to be applied in the study area. The method used to determine groundwater vulnerability to pollution is GOD, which uses three parameters to assess the vulnerability of groundwater, namely aquifer type, rock type above aquifer and groundwater level. Furthermore, the results of the vulnerability assessment using the GOD method are compared with the vulnerability assessment according to the SINTACS and DRASTIC methods that have been carried out before in this area. The results showed that the variation of groundwater vulnerability index values in the study area according to the GOD method was from 0.35 to 0.63. Locations that are classified as medium vulnerability are generally located in the limestone Sentolo Formation, while locations that are classified as high vulnerability class are located in the volcanic rock of Yogyakarta Formation. Noting the results of determining groundwater vulnerability from the three methods, it can be said that the three methods are suitable for assessing groundwater vulnerability in the study area. However, looking at the distribution pattern of the level of pollution, the DRASTIC method can provide more detailed results related to the level of vulnerability.

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Enhanced Characterization of the Krania–Elassona Structure and Functioning Allogenic Karst Aquifer in Central Greece

Geosciences ◽

10.3390/geosciences9010015 ◽

2018 ◽

Vol 9 (1) ◽

pp. 15 ◽

Cited By ~ 3

Author(s):

Antonios Manakos ◽

Maria Ntona ◽

Nerantzis Kazakis ◽

Konstantinos Chalikakis

Keyword(s):

Conceptual Model ◽

Moving Average ◽

Karst Aquifer ◽

Groundwater Vulnerability ◽

Spring Water ◽

Geological Mapping ◽

Spring Discharge ◽

Water Type ◽

Central Greece

The present study highlights the importance of geological, hydrogeological, and hydrogeochemical characterization of a karst aquifer in building a conceptual model of the system. The karst system of Krania–Elassona in central Greece was chosen for this application. Hydrogeological research included geological mapping and hydrogeological analysis. Additionally, hydrochemical analysis of water samples was performed in boreholes, rivers, and the system’s main spring. The Krania–Elassona aquifer consists of three horizons of marbles and is characterized by mature karstification. The karst aquifer is characterized by allogenic recharge mainly from the River Deskatis that accounts for up to 92% of the total flow. Groundwater and spring water are generally characterized as good quality and are suitable for irrigation and domestic use. The water type of the spring water is classified as Mg-HCO3. The application of a SARIMA (Seasonal Autoregressive Integrated Moving Average Model) model verified the conceptual model and successfully simulated spring discharge for a two-year period. The results of this study highlight the importance of basic hydrogeological research and the initial conceptualization of karst systems in reliably assessing groundwater vulnerability and modeling.

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ANALISIS KONEKTIVITAS DAN KARAKTERISTIK LORONG PADA SISTEM HIDROGEOLOGI MATAAIR BETON, KAWASAN KARST GUNUNGSEWU, KABUPATEN GUNUNGKIDUL DENGAN UJI PERUNUTAN

JURNAL GEOGRAFI ◽

10.24114/jg.v12i02.14474 ◽

2020 ◽

Vol 12 (02) ◽

pp. 105 ◽

Cited By ~ 1

Author(s):

Ahmad Cahyadi ◽

Eko Haryono ◽

Tjahyo Nugroho Adji ◽

M Widyastuti ◽

Muhammad Naufal ◽

...

Keyword(s):

Catchment Area ◽

Fluorescent Dyes ◽

Groundwater Vulnerability ◽

Tracer Test ◽

Karst Area ◽

Irrigated Rice ◽

Karst Areas ◽

Further Development ◽

Hydrogeological System

Pemahaman tentang sistem hidrogeologi dan wilayah tangkapan air dari sebuah mata air sangatlah penting. Hal ini untuk membantu pengelolaan yang menjaga kelestariannya. Mataair Beton merupakan salah satu mataair yang memiliki peranan yang sangat penting di wilayah Ponjong, Kabupaten Gunungkidul. Suplai air dari mataair ini digunakan untuk memenuhi kebutuhan air bersih, irigasi persawahan dan perikanan. Penelitian ini bertujuan untuk mengetahui konektivitas dan karakterisasi lorong di sistem hidrogeologi Mataair Beton. Metode yang digunakan adalah tracer test dengan menggunakan fluorescent dyes. Hasil analisis menunjukkan bahwa Ponor Seropan memiliki konektivitas dengan Mataair Beton, dan memiliki karakteristik lorong berupa single conduit. Perkembangan lorong yang lanjut menunjukkan bahwa sistem hidrogeologi di lokasi kajian sangat dipengaruhi oleh imbuhan airtanah dari sistem alogenik yang berhulu di wilayah non-karst dan memiliki kerentanan terhadap pencemaran airtanah yang tinggi.Kata Kunci: Karst, Sungai Alogenik, Kawasan Karst Gunung Sewu, Uji Perunutan, Mataair BetonAn understanding of the hydrogeological system and catchment area of spring is very important. This is to help manage that maintains its sustainability. Beton Resurgence is one of the springs that have a very important role in the Ponjong area, Gunungkidul Regency. Water supply from the spring is used to supply clean water, irrigated rice fields, and fisheries. This study aims to determine the connectivity and characterization of Passage in the Beton hydrogeological system. The method used is a tracer test using fluorescent dyes. The results of the analysis of breaktrough curve indicate that Seropan Sinking Stream has connectivity with Beton resurgence, and has passage characteristics in the form of a single conduit. The further development of the passage shows that the hydrogeological system is strongly influenced by groundwater recharge originating from an allogenic system that originates in non-karst areas and has a high groundwater vulnerability to pollution. Keywords: Karst, Allogenic River, Gunungsewu Karst Area, Tracer Test, Beton Resurgence

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Geomorphological characterization and mapping of Cartagena de Indias and adjacencies

Boletín de Ciencias de la Tierra ◽

10.15446/rbct.n41.51031 ◽

2017 ◽

pp. 5-15

Author(s):

Max Furrier ◽

Germán Vargas Cuervo ◽

Cristian Camilo Moncada

Keyword(s):

Point Of View ◽

Field Observations ◽

Central Theme ◽

Quaternary Sediments ◽

Quaternary Deposits ◽

Spatial Characteristics ◽

Cenozoic Tectonics ◽

Geological Formation ◽

Cartagena De Indias

This work involves a geomorphological characterization of the topographic chart 23 III D, produced by IGAC, in which were developed thematic mappings and other cartographic products where the relief, both, in its morphology and its morphometric and spatial characteristics were the central theme. From the geomorphological point of view, the area in question is located on the Sinú Belt and the unconsolidated Quaternary sediments. Sinú Belt, which oldest geological formation is dated as Oligocene-Miocene, presents the highest altitudes in the mapped area reaching 146 meters in the Cerro La Popa. The lower levels of the relief in the area are the unconsolidated Quaternary deposits, which altitudes do not go over 20 meters. From mapping surveys, interpretation of orbital images, field observations and the integration of the interpretation obtained, it can be concluded that the Cenozoic tectonics is the most important setting factor in the morphological shape of the area.

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