Estimating recharge based on long-term groundwater table fluctuation monitoring in a shallow aquifer of Malaysian tropical rainforest catchment

Saghravani, Seyed Reza; Yusoff, Ismail; Tahir, Wan Zakaria Wan Md; Othman, Zainudin

doi:10.1007/s12665-015-4387-6

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…It is specifically known as Holocene beach ridges derived from Matang Gelugor Member. It is comprises of sand, gravel and sandy clay deposits in littoral and marine environment [16,17]. In the hydrogeology perspective, Quaternary sediment is characterized by high porosity and excellent permeability that allowed water to be stored in between the grains [18].…”

Section: Study Areamentioning

confidence: 99%

Saltwater Intrusion Analysis in East Coast of Terengganu Using Multivariate Analysis

Hairoma¹

2016

MJAS

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Coastal aquifer groundwater is vulnerable to saltwater contamination as it is located near the coastline. Therefore, a study is conducted to confirm all the major source of pollutants on coastal groundwater based on 13 sampling wells that located close to Terengganu coastline as well as to assess the intensity of saltwater intrusion into the wells. Measurements of selected water quality parameters such as dissolve oxygen (DO), electrical conductivity (EC), total dissolve solid (TDS), salinity, pH, turbidity and total suspended solid (TSS) were obtained from each well by using certified scientific instruments. Data were analysed by using multivariate techniques which involves principle component analysis (PCA) and cluster analysis (CA). CA was performed by using hierarchical agglomerative cluster analysis (HACA) technique. PCA yielded two PCs where PC1 forms composite factor loadings of TDS, salinity and EC that represented the saltwater intrusion meanwhile, PC2 formed composite factors of turbidity, TSS and TDS that represented the anthropogenic pollutions. CA successfully classified sampling wells into seven clusters; Extreme High (EH), Very High (VH), High (H), Moderate (M), Low (L), Very Low (VL) and Extreme Low (EL) where each cluster represented the saltwater intrusion intensity in decreasing order. Keywords: groundwater, coastal aquifer, saltwater intrusion, multivariate techniques AbstrakAir bawah tanah dari akuifer pantai terdedah kepada pencemaran air masin kerana ia terletak berhampiran pantai. Oleh itu, satu kajian dijalankan untuk mengesahkan sumber utama pencemaran kepada air bawah tanah pantai berdasarkan 13 telaga pensampelan yang terletak berhampiran kawasan pantai Terengganu serta untuk menilai keamatan pencerobohan air masin ke dalam telaga.Pengukuran parameter kualiti air seperti oksigen terlarut (DO), kekonduksian elektrik (EC), jumlah pepejal terlarut (TDS), kemasinan, pH, kekeruhan dan jumlah pepejal terampai (TSS) diambil dari setiap telaga dengan menggunakan peralatan saintifik. Data dianalisis menggunakan teknik multivariat iaitu analisis komponen utama (PCA) dan analisis kelompok (CA). CA dilakukan menggunakan teknik analisis kelompok hierarki agglomeratif (HACA). PCA menghasilkan dua PC yang mana, PC1 membentuk faktor komposit TDS, kemasinan dan EC yang mewakili pencerobohan air masin manakala, PC2 membentuk faktor komposit kekeruhan, TSS dan TDS yang mewakili pencemaran antropogenik. CA berjaya mengelaskan telaga pensampelan kepada tujuh kelompok; Tinggi Ekstrem (EH), Sangat Tinggi (VH), Tinggi (H), Sederhana (M), Rendah (L), Sangat Rendah (VL) dan Rendah Ekstrem (EL) yang mana setiap kelompok mewakili keamatan pencerobohan air masin dalam urutan berkurangan.

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Section: Study Areamentioning

confidence: 99%

Saltwater Intrusion Analysis in East Coast of Terengganu Using Multivariate Analysis

Hairoma¹

2016

MJAS

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“…On the basis of groundwater level and precipitation time series of sufficient duration and temporal resolution, it is possible to evaluate the influences of rainfall characteristics on episodic groundwater recharge in different hydrogeological conditions and in consequence of different hydro-meteorological events. It is also possible to estimate aquifer parameters, evapotranspiration and effective infiltration from precipitation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Modelling of the Complex Groundwater Level Dynamics during Episodic Rainfall Events of a Surficial Aquifer in Southern Italy

Pastore

Cherubini

Doglioni

et al. 2020

Water

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We analyzed the complex dynamics that are involved the groundwater level variations due to the episodic rainfall supply in the Ionian coastal plain surficial aquifer located in Southern Italy. In this aquifer, as a consequence of the particular hydrogeological framework, both direct and lateral recharge mechanisms coexist. Hence, the dynamics of groundwater level variations are quite complex and strongly non-linear. Our focus was essentially on the short-term behavior of groundwater levels, with a specific analysis on episodic rainfall events. To model these dynamics, due to the presence of the preferential pathways in the infiltration processes, a kinematic dispersion wave model was used. Specifically, a one-dimensional and non-linear particle-based numerical model was developed. It uses ideal particles with constant water volume travel, according to celerity and hydraulic dispersion, to simulate the infiltration rate wave through the vadose zone. The infiltration rate that reaches the water table represents the input function to evaluate the aquifer groundwater level fluctuations. As a consequence of the special lithological and storage capacity characteristics of the surficial layers, groundwater flow conditions change from unconfined to confined. The developed model analyzes the direct groundwater supply under natural conditions, including episodic rainfall, and it has been validated using a high-resolution time series of rainfall data and groundwater level obtained from the monitoring station Terra Montonata.

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“…Several authors have used groundwater table fluctuation to estimate aquifer parameters, evapotranspiration and effective infiltration from precipitation (White, 1932;Weeks and Sorey, 1973;Gerhart, 1986;Hall and Risser, 1993;Delin et al, 2007;Cuthber et al, 2013;Saghravani et al, 2015;Nimmo et al, 2015;Yang et al, 2018). Given groundwater level and precipitation records of sufficient duration and temporal resolution, the influence of rainfall characteristics on episodic groundwater recharge in different hydrometeorological and hydrogeological condition is possible.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Model the Hydrodynamic Response of the Surficial Level of the Ionian Multilayered Aquifer during Episodic Rainfall Events

Pastore¹,

Cherubini²,

Doglioni³

et al. 2020

Preprint

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The paper presents a modeling framework to analyze the effect of episodic rainfall supply on groundwater dynamics in the Ionian coastal plain multilayered aquifer. The focus is essentially on the short-term behavior of the shallowest layer, with a specific analysis on episodic rainfall events. In the studied aquifer, groundwater level responds sensitively to rainfall events, highlighting the presence of preferential recharge zones. The hydraulic head peak is a function of groundwater level antecedent to the rainfall event. A kinematic dispersion wave model was used to model infiltration processes via preferential pathways. A one-dimensional and non-linear particle based numerical model was developed. Particles with constant water volume travel according to celerity and hydraulic dispersion to simulate the infiltration rate wave through the vadose zone. The flow rate that reaches the water table represents the input function to determine groundwater level fluctuations along groundwater flow direction and according to the lithological features of the surficial levels of the multilayered aquifer, its storage capacity changes passing from unconfined to confined conditions. The model was validated with high time resolution time series of precipitation and groundwater level coming from Terra Montonata meteo-climatic and groundwater level monitoring station. The developed model represents a basis for evaluating and predicting groundwater discharge of the shallowest layers of the Ionian coastal multilayered aquifer under natural conditions including episodic rainfall.

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Estimating recharge based on long-term groundwater table fluctuation monitoring in a shallow aquifer of Malaysian tropical rainforest catchment

Cited by 10 publications

References 33 publications

Saltwater Intrusion Analysis in East Coast of Terengganu Using Multivariate Analysis

Saltwater Intrusion Analysis in East Coast of Terengganu Using Multivariate Analysis

Modelling of the Complex Groundwater Level Dynamics during Episodic Rainfall Events of a Surficial Aquifer in Southern Italy

A Novel Approach to Model the Hydrodynamic Response of the Surficial Level of the Ionian Multilayered Aquifer during Episodic Rainfall Events

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