Accuracy of Surface Water Maps Derived from Radar Satellite Imagery Compared to Multispectral Satellite Imagery DOI Creative Commons
Katelyn Kirby, Colin D. Rennie,

Riley Poot

et al.

Canadian Journal of Remote Sensing, Journal Year: 2024, Volume and Issue: 50(1)

Published: Dec. 5, 2024

Optical and radar remote sensing are both used to map surface water features. Since use cases range considerably in the literature between applications, a direct comparison is warranted assess how well each perform wide of geographic settings using classification methods. Thus, maps generated from Sentinel-1 Synthetic Aperture Radar (S1SAR) Sentinel-2 Multispectral Instrument (S2MSI) imagery were compared across four machine learning techniques eight diverse image areas Canada. Additionally, polarizations multispectral bands varied understand their effect. The results validated high resolution satellite imagery, analysis variance was calculated. S2MSI consistently produced higher accuracy S1SAR. Contrary previous understanding, cross-polarization did not produce significantly more accurate than like-polarization, same true for dual single polarization. introduction an additional band improved significantly. In flooded conditions, polarization best results, detection ice, results. These findings will increase quality efficient generation resource management, climate change impact studies, other disciplines.

Language: Английский

Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity DOI Creative Commons
Hayden A. Tackley, Barret L. Kurylyk, Craig B. Lake

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172344 - 172344

Published: April 10, 2024

Estuaries are vulnerable to oceanic and atmospheric climate change. Much of the research investigating change impacts on estuaries is focused saltwater intrusion within surface water due drought rising sea levels, with implications for ecosystems humans. Groundwater soil near may also be influenced, as estuary salinity hydraulic head changes can impact soils aquifers not previously at risk salinization. This study was conducted address knowledge gaps related present future groundwater distribution in a system connected macro-tidal estuary. The studied experiences tidal bore its connection Bay Fundy Nova Scotia, Canada. A parcel agricultural land adjacent selected assess response episodic fluctuations levels salinity. monitoring electromagnetic surveys were map patterns. numerical model flow solute transport informed by field data used investigate how varying droughts sea-level rise could Results showed that, contrast salt wedges observed along marine coasts, saline existed plume immediately around Model simulations that short-term had an insignificant However, permanent increases caused increased volume 86 %, or additional ∼11 m horizontally ∼ 4.5 vertically. Our results suggest river this setting would result widespread salinization porewater soils, but more extensive experienced permeable estuarine zones. Findings inform management decisions regions exposed future.

Language: Английский

Citations

5
Evaluating the Impact of Mitigation Measures on Shallow Groundwater Salinization in a Coastal Subsided Plain DOI

C. H. Tsai,

Xinren Zhang,

Yuka Ito

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Sea level trends along the South African coast from 1993 to 2022 using XTRACK altimetry, tide gauges, and GNSS measurements DOI Creative Commons
Franck Eitel Kemgang Ghomsi, Muharrem Hilmi Erkoç, Roshin P. Raj

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Feb. 10, 2025

This study presents a comprehensive investigation of the complex dynamics sea-level rise (SLR) and its multiple impacts on coastal regions in southern Africa. We meticulously analyse trends patterns SLR subsidence rates using wealth data from 1993 to 2022, including observations network 10 reliable tide gauges XTRACK processed Coastal Altimetry Approach minimise shortcomings conventional altimetry data. Our results show that sea level areas South Africa, such as Cape Town (6.3 mm/yr), is almost double global average (3.3 mm/yr). alarming rate SLR, coupled with more than 2.2 mm/yr, poses significant immediate threat communities, infrastructure ecosystems. research also highlights impact seismic activity dynamics, further exacerbating challenges posed by SLR. By incorporating influence earthquakes subsidence, we provide nuanced understanding interplay natural anthropogenic factors contributing region. In addition, our sheds light wider implications for some Africa's most iconic culturally heritage sites, highlighting urgent need proactive management adaptation strategies.

Language: Английский

Citations

0
Saltwater intrusion in estuarine aquifers through tidal river-groundwater interactions: Three-dimensional experiments and fully-coupled numerical simulations DOI
Yu Ye,

T. Y. Tang,

Yifan Xie

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133281 - 133281

Published: April 1, 2025

Language: Английский

Citations

0
Comparative study for coastal aquifer vulnerability assessment using deep learning and metaheuristic algorithms DOI
Mojgan Bordbar, Essam Heggy, Changhyun Jun

et al.

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(16), P. 24235 - 24249

Published: March 4, 2024

Language: Английский

Citations

1
Assessment of Groundwater Vulnerability to Seawater Intrusion Using GALDIT, SITE and SIVI Methods in Laspias River Coastal Aquifer System, NE Greece DOI Open Access

Christina Pliaka,

Ioannis Gkiougkis,

Dimitrios Karasogiannidis

et al.

Water, Journal Year: 2024, Volume and Issue: 16(10), P. 1341 - 1341

Published: May 8, 2024

This paper presents the investigation of groundwater vulnerability to seawater intrusion aquifer system in coastal area Laspias River, NE Greece, for year 2023, by applying GALDIT, SITE and SIVI methods, context management area. The relevant research works include collection analysis data information regarding geological geomorphological environment, as well hydrogeological calculation indices values is described, results from application methods are presented, design maps study concludes with findings proposals useful reliable assessment regime wider

Language: Английский

Citations

1
Coastal vulnerability assessment using the GALDIT model: a case study of Mukkani and Palayakayal regions in the Thamirabarani delta, Southern Tamil Nadu, India DOI
S. Richard Abishek,

A. Antony Ravindran,

R. Sakthi Priya

et al.

Modeling Earth Systems and Environment, Journal Year: 2024, Volume and Issue: 10(4), P. 5257 - 5271

Published: June 14, 2024

Language: Английский

Citations

1
Groundwater monitoring infrastructure: Evaluation of the shallow urban and coastal network in Ōtautahi Christchurch DOI Creative Commons
Amandine L. Bosserelle, Matthew W. Hughes

Journal of Hydrology Regional Studies, Journal Year: 2024, Volume and Issue: 55, P. 101934 - 101934

Published: Aug. 23, 2024

Ōtautahi Christchurch, New Zealand Urban shallow groundwater monitoring networks are becoming widespread in and globally. A reliable infrastructure is important to develop knowledge on water table aquifers coastal cities like Christchurch. Previous investigations have shown vulnerability salinisation contamination urban settings, exacerbates flooding from climate change the impact of rising sea levels. Following 2010–2011 Canterbury earthquake sequence, data acquisition establishment a geotechnical database Christchurch provided unprecedented information subsurface conditions. The installation opened field Zealand-based hydrogeological studies, including continuous measurements This study presents context provides an overview seismic impacts groundwater, documents network's development. Methods for assessing network included surveys digital review. overall good condition robustness mean dataset held by city regional councils should be more widely used benefit community. Implications researchers asset managers that maintenance availability prioritised. Records essential source manage resources under sea-level rise

Language: Английский

Citations

1
Numerical modeling for determination of the dominant factor inducing saltwater intrusion into shallow aquifer in the Mekong River Estuary within the Mekong Delta, Vietnam DOI Creative Commons
Han Xiao, Zirui Zhang, Yin Tang

et al.

Sustainable Horizons, Journal Year: 2024, Volume and Issue: 12, P. 100111 - 100111

Published: May 27, 2024

Due to climate change and ever-increasing groundwater exploitation under the background of population growth economic development since 1990s, saltwater intrusion (SWI) into coastal aquifers has been recognized as a significant geo-environmental issue in Mekong Delta (MKD) southern Vietnam. Previous research indicated that over-exploitation mainly causes SWI deep aquifer seawater is dominant source aquifer, however, whether or saline river water shallow remains unknown. In this study, 3D flow salt transport SEAWAT model was developed calibrated/validated simulate processes surface interactions freshwater River Estuary within MKD during 2012–2021. Simulation results that: (1) saltwater/freshwater wedge qh migrates 4.3 km landward (TDS 20–35 kg/m3) storage increases 101.5 % from 2012 2021; (2) annual perspective; (3) November August (10 months) while Bassac September October (2 monthly (4) contribution ratios ocean, River, one year were 80.29 %, 3.42 16.29 respectively. The outcome study can provide useful reference for implementation efficient effective adaptation strategies resources management eco-environment protection restoration against changing MKD.

Language: Английский

Citations

0
Hydrogeochemical characteristics of shallow aquifers in Thanh Phu District, Ben Tre Province, Vietnam DOI Open Access

Le Thi Thuy Van,

Nguyen Thi Thuy Luyen,

Châu Hồng Thắng

et al.

IOP Conference Series Earth and Environmental Science, Journal Year: 2024, Volume and Issue: 1349(1), P. 012004 - 012004

Published: May 1, 2024

Abstract Shallow aquifers in the Thanh Phu coastal area Ben Tre Province are increasingly withdrawn for domestic and irrigation purposes. However, groundwater resources here declining quality due to effects of seawater intrusion anthropogenic activities. It requires an understanding origin changes water protect local resources. By applying hydrogeochemical approach, have been clarified. A total 35 samples were collected during 2023 dry season. The laboratory analysis included 16 ions. results show that types Ca-Cl, Ca-Mg-Cl Na-Cl, with domination third pattern. Hydrochemical characteristics shown evaporation, silicate weathering, cation exchange marine as vital processes governing mineralization regional groundwater. Most poor quality, not adapting standards according National Technical Regulation on Domestic Water Quality WHO 2011. treatment before being used SAR, Na%, PI, KR EC values displayed was still acceptable purposes, demonstrating prospect using agricultural purposes study area.

Language: Английский

Citations

0