scholarly journals Elemental Enrichment in Shallow Subsurface Red Sea Coastal Sediments, Al-Shuaiba, Saudi Arabia: Natural vs. Anthropogenic Controls

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 898
Author(s):  
Ibrahim M. Ghandour ◽  
Mohammed H. Aljahdali
Keyword(s):  
Saudi Arabia ◽  
Red Sea ◽  
Driving Forces ◽  
Road Construction ◽  
Coastal Sediments ◽  
Medieval Climate Anomaly ◽  
Climate Anomaly ◽  
Shallow Subsurface ◽  
The Road ◽  
The Core

Geochemical analysis of the 23 sediment samples collected from a short (0.6 m long) core retrieved from the coastal creek that was previously connecting the northern and southern Al-Shuaiba Lagoons, Red Sea, Saudi Arabia, was accomplished to assess the elemental enrichment levels and the natural and anthropogenic driving forces for this enrichment. Statistical analysis and upcore variation in elemental concentrations enabled subdivision of the core formally into three units, lower, middle, and upper. The enriched elements in the lower and middle units display poor to negative correlations with the enriched elements in the upper unit. The lower unit is enriched in elements (Mo, As, U, and Re) suggesting deposition under anoxic conditions, possibly related to the Medieval Climate Anomaly. The middle unit is enriched in the carbonate-related constituents (CaCO3, Ca, and Sr). The upper unit is enriched in elements that co-vary significantly with Al suggesting increased terrigenous supply associated with the construction of the road between the two lagoons. The enrichment of elements in the lower and middle units is naturally driven, whereas the enrichment of lithogenic elements in the upper unit, though of geogenic origin, is induced after the road construction.

scholarly journals Assessing Relationships between Land Use Changes and the Development of a Road Network in the Hodonín Region (Czech Republic)

2019 ◽  
Vol 38 (1) ◽  
pp. 145-159 ◽  
Author(s):  
Jiří Jedlička ◽  
Marek Havlíček ◽  
Ivo Dostál ◽  
Jiří Huzlík ◽  
Hana Skokanová
Keyword(s):  
Land Use ◽  
Czech Republic ◽  
Road Network ◽  
Driving Forces ◽  
Land Use Changes ◽  
Road Construction ◽  
Time Interval ◽  
Historical Sources ◽  
The Road ◽  
Anthropogenic Processes

Abstract The paper assesses the development of land use and a road network from 1836 to 2016 in the Hodonín region (Czech Republic). The aim of the article is to verify relationship between the road construction and land use changes in their vicinity. The intensity of land use change processes between adjacent periods was calculated at various distances from roads. ESRI’s geographic information systems and geostatistics were used. This helped in assessing significance of impact of road vicinity on land use changes. The time interval of periods for comparison varied between 25 and 80 years due to availability of historical sources. In each period about 20% of the region was affected by land use changes. After the roads were built, there was an increase in the intensity of land use changes in their vicinity. It has been proofed that presence of a road can be considered one of the driving forces of long-term land use changes in this region. This so-called technological driving force impacted mainly urbanisation and other anthropogenic processes, agricultural intensification and grassing. Its significance is gradually increasing due to urbanisation, industrialisation, motorization and the rising mobility. Our results from the Hodonín region indicate that urbanisation and other anthropogenic processes have the closest relationship with the distance from major roads.

Late Holocene Red Sea Coastal Evolution: Evidence from Shallow Subsurface Sedimentary Facies, North Al-Wajh, Saudi Arabia

2020 ◽  
Author(s):  
Ibrahim M. Ghandour ◽  
Jawad Majeed ◽  
Aaid G. Al-Zubieri ◽  
Ammar A. Mannaa ◽  
Mohammed H. Aljahdali ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Red Sea ◽  
Late Holocene ◽  
Sedimentary Facies ◽  
Coastal Evolution ◽  
Shallow Subsurface

scholarly journals Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds

2011 ◽  
Vol 7 (4) ◽  
pp. 1123-1138 ◽  
Author(s):  
K. B. Rodgers ◽  
S. E. Mikaloff-Fletcher ◽  
D. Bianchi ◽  
C. Beaulieu ◽  
E. D. Galbraith ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Little Ice Age ◽  
Driving Forces ◽  
Ice Age ◽  
Medieval Climate Anomaly ◽  
Climate Anomaly ◽  
Ocean Winds ◽  
Main Driver ◽  
Ocean Wind ◽  
Earth System Models

Abstract. Tree ring Δ14C data (Reimer et al., 2004; McCormac et al., 2004) indicate that atmospheric Δ14C varied on multi-decadal to centennial timescales, in both hemispheres, over the period between AD 950 and 1830. The Northern and Southern Hemispheric Δ14C records display similar variability, but from the data alone is it not clear whether these variations are driven by the production of 14C in the stratosphere (Stuiver and Quay, 1980) or by perturbations to exchanges between carbon reservoirs (Siegenthaler et al., 1980). As the sea-air flux of 14CO2 has a clear maximum in the open ocean regions of the Southern Ocean, relatively modest perturbations to the winds over this region drive significant perturbations to the interhemispheric gradient. In this study, model simulations are used to show that Southern Ocean winds are likely a main driver of the observed variability in the interhemispheric gradient over AD 950–1830, and further, that this variability may be larger than the Southern Ocean wind trends that have been reported for recent decades (notably 1980–2004). This interpretation also implies that there may have been a significant weakening of the winds over the Southern Ocean within a few decades of AD 1375, associated with the transition between the Medieval Climate Anomaly and the Little Ice Age. The driving forces that could have produced such a shift in the winds at the Medieval Climate Anomaly to Little Ice Age transition remain unknown. Our process-focused suite of perturbation experiments with models raises the possibility that the current generation of coupled climate and earth system models may underestimate the natural background multi-decadal- to centennial-timescale variations in the winds over the Southern Ocean.

Contamination and ecological risk assessment of the Red Sea coastal sediments, southwest Saudi Arabia

2020 ◽  
Vol 154 ◽  
pp. 111125
Author(s):  
Ali Kahal ◽  
Abdelbaset S. El-Sorogy ◽  
Saleh Qaysi ◽  
Sattam Almadani ◽  
Osama M. Kassem ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Saudi Arabia ◽  
Red Sea ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Coastal Sediments

The Design and Implementation of Roadworks Management System Based on GIS

2013 ◽  
Vol 405-408 ◽  
pp. 1739-1742
Author(s):  
You Heng Zhang ◽  
Bao Bing Su
Keyword(s):  
Construction Management ◽  
Management System ◽  
3D Visualization ◽  
Road Construction ◽  
Longitudinal Section ◽  
Secondary Development ◽  
Engineering Construction ◽  
The Road ◽  
The Core ◽  
Spatial Features

Most of current construction project management software focus on text, quantity information and lack of engineering graphics, display, query and analysis of features and other spatial features. In order to solve these problems, GIS is taken as the core, Multipatch programming is used in the natural ground and roadbed, drawing 2D features are stretched for 3D visualization and dynamic 3D display of construction progress. The TIN model is constructed and the main spatial analysis functions are implemented, including the query of 3D point information, the query of longitudinal section, cross section, volume, surface area as so on at any position. A road engineering construction management system is developed in Microsoft Visual Studio2010 platform using c # 4.0 language, the GIS secondary development tools ArcGIS Engine9.3 and Microsoft Access2007 database. GIS is taken as the core in basic framework of the system, the system has a certain application prospect in the road construction management.

Geochemical Characterization of Al-Lith Coastal Sediments, Red Sea, Saudi Arabia

2019 ◽  
Vol 45 (1) ◽  
pp. 291-306
Author(s):  
Rashad A. Bantan ◽  
Ali A. Khawfany ◽  
Ali S. Basaham ◽  
Amin M. Gheith
Keyword(s):  
Saudi Arabia ◽  
Red Sea ◽  
Coastal Sediments ◽  
Geochemical Characterization
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