Impacts of a newly formed lava delta on the marine environment: Lava-induced upwelling and abrupt chlorophyll depletion during the Tajogaite eruption (La Palma, 2021) DOI Creative Commons
Alba González‐Vega, Juan Pablo Martín-Díaz, J.T. Vázquez

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 944, P. 173915 - 173915

Published: June 11, 2024

The 2021 Tajogaite eruption in La Palma (Canary Islands, Spain) emitted vast volumes of lava during 85 days, which reached the ocean several occasions at western flank island. Most these flows merged to create a primary delta, covering an area 48 ha, with additional 30 ha underwater. Here we characterize effects lava-seawater interaction on surrounding marine environment. was sampled two multidisciplinary oceanographic cruises: first one comprised days before and after contact; second took place month later, when delta already formed but still receiving inputs. Physical-chemical anomalies were found whole water column different depths up 300 m all measured parameters, such as turbidity (+9 NTU), dissolved oxygen concentration (−17.17 μmol kg−1), pHT25 (−0.1), chlorophyll-a (−0.33 mg m−3). Surface temperature increased +2.3 °C (28.5 °C) surface salinity showed increases decreases −1.01 +0.70, respectively, radius 4 km around delta. In column, heated waters experimented lava-induced upwelling, bringing deeper, nutrient-rich shallower depths; however, this feature did not trigger any phytoplankton bloom. fact, integrated abrupt decrease −41 % just −69 compared prior conditions. depletion distance larger than 2.5 (not delimited).

Language: Английский

Modelling change detection for unveiling urban transitions: using machine learning algorithms and Sentinel-2 data in Larache City, Morocco DOI
Tarik Chafiq,

Mohamed Hmamou,

Imrane Ouhammou

et al.

Modeling Earth Systems and Environment, Journal Year: 2023, Volume and Issue: 10(2), P. 1711 - 1725

Published: Sept. 27, 2023

Language: Английский

Citations

5
Multi-Mission Satellite Detection and Tracking of October 2019 Sabiti Oil Spill in the Red Sea DOI Creative Commons

Koteswararao Vankayalapati,

Hari Prasad Dasari, Sabique Langodan

et al.

Remote Sensing, Journal Year: 2022, Volume and Issue: 15(1), P. 38 - 38

Published: Dec. 22, 2022

A multi-mission satellite remote sensing (MSRS) approach is explored to detect and track leaked oil from the Sabiti tanker accident that occurred in central Red Sea on 11 October 2019 (RSOS-2019). The spilled spread rapidly reached coastal land near Jeddah, second largest city of KSA, 17 October. Different spill detection algorithms were implemented SAR optical sensor-based images spill. Sentinel-1 most efficient at detecting thickness RSOS-2019, but their spatio-temporal coverage greatly limits use for tracking movement. propagation well captured by Sentinel-2 up three weeks after day, agreement with images. MODIS successfully detected narrow patch was incident day widespread patches two days after. Landsat-8 RGB composite thermal infrared 13 By filtering clouds Meteosat through sequential analysis, movement efficiently tracked PlanetScope available between 12 enabled waters. inferred movements are consistent ocean currents as revealed a high-resolution regional reanalysis. Our results demonstrate potential MSRS spills open waters real-time.

Language: Английский

Citations

8
Assessing the Performance of a Citizen Science Based Water Quality Monitoring Program for Nitrates Using Test Strips Implemented in the Medjerda Hydrosystem in Northern Tunisia DOI Creative Commons
Safa Chaabane,

Khalifa Riahi,

Slaheddine Khlifi

et al.

Hydrology, Journal Year: 2024, Volume and Issue: 11(1), P. 6 - 6

Published: Jan. 1, 2024

Recent technological progress in water management of hydrosystems has been made to deploy efficient and effective quality monitoring systems (WQMS). Among these, a citizen science (CS)-based (WQM) program using test strips is considered as smart tool that may aid the production reliable, continuous, comprehensive data on resources over broad range spatial temporal scales. In this case study, objective evaluate performance CS-based WQM for nitrates assessment Medjerda watershed Northern Tunisia. Overall, 137 samples were collected from 24 sampling sites analyzed by 33 participants. Citizens involved regrouped five types according their socio-economic characteristics. Statistical tests, analysis variance (ANOVA) multiple correspondence analyses (MCA) achieved survey goodness fit CS contribution collection terms profile participant. The results show could be reliable obtaining levels nitrate samples. Water trips can conveniently used citizens when they are rigorously following manufacturer’s instructions. Additional efforts communication training help improve CS-WQM watershed.

Language: Английский

Citations

1
Estimation of Ground Water Recharge in the Command Area of Krishna Central Delta DOI Creative Commons
S M Nazmuz Sakib

Published: Jan. 9, 2024

Groundwater recharge is the most important component in all water balance studies. Norms set by Resource Estimation Committee, GEC-2015 was used for estimation of recharge. The study conducted Bandar canal command area constituting Krishna Central Delta Andhra Pradesh. Following norms GEC-2015, estimated past decade from 2012-13 to 2021-22 and it found that rate ranging 438135.8 ha-m year 2015-16 1677730 2013-14.While computing gross recharge, attributed rainfall, seepage, irrigation return flow ponds/tanks are considered.

Language: Английский

Citations

1
Impacts of a newly formed lava delta on the marine environment: Lava-induced upwelling and abrupt chlorophyll depletion during the Tajogaite eruption (La Palma, 2021) DOI Creative Commons
Alba González‐Vega, Juan Pablo Martín-Díaz, J.T. Vázquez

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 944, P. 173915 - 173915

Published: June 11, 2024

The 2021 Tajogaite eruption in La Palma (Canary Islands, Spain) emitted vast volumes of lava during 85 days, which reached the ocean several occasions at western flank island. Most these flows merged to create a primary delta, covering an area 48 ha, with additional 30 ha underwater. Here we characterize effects lava-seawater interaction on surrounding marine environment. was sampled two multidisciplinary oceanographic cruises: first one comprised days before and after contact; second took place month later, when delta already formed but still receiving inputs. Physical-chemical anomalies were found whole water column different depths up 300 m all measured parameters, such as turbidity (+9 NTU), dissolved oxygen concentration (−17.17 μmol kg−1), pHT25 (−0.1), chlorophyll-a (−0.33 mg m−3). Surface temperature increased +2.3 °C (28.5 °C) surface salinity showed increases decreases −1.01 +0.70, respectively, radius 4 km around delta. In column, heated waters experimented lava-induced upwelling, bringing deeper, nutrient-rich shallower depths; however, this feature did not trigger any phytoplankton bloom. fact, integrated abrupt decrease −41 % just −69 compared prior conditions. depletion distance larger than 2.5 (not delimited).

Language: Английский

Citations

1