Kriging Analysis for Spatio-temporal Variations of Ground Level Ozone Concentration

Gorai, Amit Kumar; Jain, Kumar Gourav; Shaw, Neha; Tuluri, Francis; Tchounwou, Paul B.

doi:10.5572/ajae.2015.9.4.247

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…The conductive area may suggest a target of groundwater. This layer is the lower aquifer of the area and occurs in all VES of Ngam except VES 25 The second geoelectric unit is sandy clay with resistivity ranging from 600 to 9500 Ω⋅m. This wide range in resistivity values is due to the expected intercalation of clay and dry sand with limestone in some VES.…”

Section: Ngam Campmentioning

confidence: 99%

“…To achieve this purpose, different maps were built (Figs. 8 -11) using Kriging gridding method (Goovaerts 1998(Goovaerts , 2001Gorai et al 2015): depth of the aquifers (upper and lower), depth of the lower aquifer, true resistivity of the aquifers (upper and lower), true resistivity of the lower aquifer, and thickness of the lower aquifer were established.…”

Section: Depth and True Resistivity Mapsmentioning

confidence: 99%

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Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Raouf

Njeudjang

Yue

et al. 2022

Preprint

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Djohong municipality is located at the border between Eastern Cameroon and Central African Republic (CAR), in the Mbere division. The region is a shelter for thousands of people fleeing the socio-political crisis in CAR and it lacks safe drinking water supply. Surface water, rainwater, and shallow groundwater wells are the main water sources. As a result, deep aquifers appear to be an affordable solution to the widespread water demand gap in the region of Djohong. Forty-nine Schlumberger vertical electrical sounding (VES) were carried out in the framework of this study with maximum current electrode spacing of 240 m. The purpose was to investigate the occurrences of groundwater and related structural elements in the study area, which hosts two refugee camps, Ngam and Borgop. Eight geoelectric profiles were realized and their geological characteristics vary from the altered part to the bedrock, with ferruginous sediments and metaconglomerates in between. The altered part is composed of topsoil, travertines, sandy clay, clayey sand, and fractured shales with different geophysical characteristics. Two aquifer systems were highlighted, respectively in the altered soils of clayey sand and low permeability fractured rocks. The upper aquifer made of clayey sand is located in Ngam camp with thickness of 5 to 15 m and resistivity of 700 – 1500 Ω.m. The lower aquifer which is considered the main aquifer is located in both camps. It is hosted in the low permeability fractured shales of the Ngam camp, with resistivity of 200 to 1000 Ω.m and thickness of 34 to 82 m. In the Borgop camp, it occurs in the fractured granitic bedrock at about 8 and 19 m deep. Structurally, the study area is controlled by several potential faults, with NE – SW strike as a whole. The present study highlighted favourable conditions reducing geological and hydrogeological limitations to provision of safe drinking water for refugees of the two camps in Djohong.

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Section: Ngam Campmentioning

confidence: 99%

Section: Depth and True Resistivity Mapsmentioning

confidence: 99%

Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Raouf

Njeudjang

Yue

et al. 2022

Preprint

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“…The Kriging interpolation technique constructed the water level contour map with the help of ArcMap 10.3. Kriging is better than other methods because of its accuracy [17]. The temperature (T), pH, electrical conductivity (EC), and total dissolved solids (TDS) were measured on-site with the use of a water test kit (GTL-HG-002) that was calibrated beforehand.…”

Section: Groundwater Samplingmentioning

confidence: 99%

Influence of coastal alluvial aquifer on groundwater chemistry in Wates, Yogyakarta, Indonesia

Thin

Hendrayana

Kawasaki

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Saline groundwater is found far from the coastline, whereas closer groundwater has low salinity in the Wates area, Indonesia. This situation which has led to problems linked to the coastal aquifer, shows different groundwater chemistries. This connection needs to highlight the geochemical evolution of aquifers. This research aims to evaluate the hydrochemical characteristics in Wates Sub-District, Kulon Progo District, Indonesia. The study area is located in the southern part of the Kulon Progo with an aquifer of marine and fluvial deposits. The boundary of the south is the Indian Ocean. The approach is based on analyzing the major ions of 27 groundwater samples, and the XRD results include the Stiff diagram and the Stuyfzand classification. The Stiff diagram showed in agreement with that of the Stuyfzand classification. Results showed that the F2-(CaHCO3)2Ø and F1-(NaMix)Ø types reflect the recharge process and dominate the dissolution of silicate minerals. Halite dissolution originates in topographically flat areas of the Bs1-NaCl (-) water. Total hardness is softer than others as a result of cation exchange. The groundwater chemistry’s geochemical processes are the dissolution of silicate and halite minerals, ion exchange, and fresh and seawater mixing. This research indicates to focus on pumping problems in the aquifer.

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“…A family of statistical methods known as "geo-statistics" was created to assess and forecast the values of something that is spread in the air or at ground level [24]. Kriging is a geostatistical method for estimating values in unknown areas that considers the degree of variation and distance between known data points.…”

Section: Introductionmentioning

confidence: 99%

Ground-Level Particulate Matter (PM2.5) Concentration Mapping in the Central and South Zones of Peninsular Malaysia Using a Geostatistical Approach

Rusmili,

Mohamad Hamzah,

Choy

et al. 2023

Sustainability

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Fine particulate matter is one of the atmospheric contaminants that exist in the atmosphere. The purpose of this study is to evaluate spatial–temporal changes in PM2.5 concentrations in the central and south zones of Peninsular Malaysia from 2019 to 2020. The study area involves twenty-one monitoring stations in the central and south zones of Peninsular Malaysia, using monthly and annual means of PM2.5 concentrations. The spatial autocorrelation of PM2.5 is calculated using Moran’s I, while three semi-variogram models are used to measure the spatial variability of PM2.5. Three kriging methods, ordinary kriging (OK), simple kriging (SK), and universal kriging (UK), were used for interpolation and comparison. The results showed that the Gaussian model was more appropriate for the central zone (MSE = 14.76) in 2019, while the stable model was more suitable in 2020 (MSE = 19.83). In addition, the stable model is more appropriate for both 2019 (MSE = 12.68) and 2020 (8.87) for the south zone. Based on the performance indicator, universal kriging was chosen as the best interpolation method in 2019 and 2020 for both the central and south zone. In conclusion, the findings provide a complete map of the variations in PM2.5 for two different zones, and show that interpolation methods such as universal kriging are beneficial and could be extended to the investigation of air pollution distributions in other areas of Peninsular Malaysia.

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Kriging Analysis for Spatio-temporal Variations of Ground Level Ozone Concentration

Cited by 7 publications

References 40 publications

Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Comprehensive Studies of Hydrogeophysical Potential of Groundwater Occurrences in Djohong Municipality, Adamawa Cameroon

Influence of coastal alluvial aquifer on groundwater chemistry in Wates, Yogyakarta, Indonesia

Ground-Level Particulate Matter (PM2.5) Concentration Mapping in the Central and South Zones of Peninsular Malaysia Using a Geostatistical Approach

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