scholarly journals Impact of human interventions and coastal processes along the Nile Delta coast, Egypt during the past twenty-five years

2016 ◽  
Vol 42 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Elham M. Ali ◽  
Islam A. El-Magd
Keyword(s):  
Nile Delta ◽  
Coastal Processes ◽  
The Past ◽  
Human Interventions ◽  
Nile Delta Coast

Salt marshes adjustment to anthropogenic pressures and sea-level rise

2021 ◽  
Author(s):  
A. Rita Carrasco ◽  
Katerina Kombiadou ◽  
Miguel Amado
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Salt Marshes ◽  
Anthropogenic Pressures ◽  
The Past ◽  
Ria Formosa ◽  
Sediment Loads ◽  
Human Interventions ◽  
South Portugal ◽  
And Sea Level

<p>It is predictable that salt marshes in regions, where sediment loads are high, should be stable against a broader range of relative sea level scenarios than those in sediment-poor systems. Despite extensive theoretical and laboratory studies, additional syntheses of marsh ‘persistence’ indicators under human interventions and accelerated sea-level rise rates are still needed. This study investigates the recent lateral changes occurring in lagoon-type marshes of the Ria Formosa lagoon (south Portugal) in the presence of human interventions and sea-level rise, to identify the major drivers for past marsh evolution and to estimate potential future trends. The conducted analysis assessed the past geomorphological adjustment based on imagery analysis and assessed its potential future adjustment to sea-level rise (~100 years) based on modelled land cover changes (by employing the SLAMM model within two sea-level rise scenarios).</p><p>Salt marshes in the Ria Formosa showed slow lateral growth rates over the last 70 years (<1 mm∙yr<sup>-1</sup>), with localized erosion along the main navigable channels associated with dredging activities. Higher change rates were noted near the inlets, with stronger progradation near the natural inlets of the system, fed by sediment influx pulses. Any potential influence of sea-level increase to an intensification of marsh-edge erosion in the past, could not be distinguished from human-induced pressures in the area. No significant sediment was exchanged between the salt marshes and tidal flats, and no self-organization pattern between them was observed in past. The related analysis showed that landcover changes in the salt marsh areas are likely to be more prominent in the future. The obtained results showed evidence of non-linearity in marsh response to high sea-level rise rates, which could indicate to the presence of critical thresholds and potential negative feedbacks within the system, with significant implications to marsh resilience.</p>

scholarly journals FORECAST OF THE REFORMATION OF THE KRASNOYARSK RESERVOIR COASTAL ZONE IN THE KURTAK VILLAGE

2019 ◽  
Vol 29 (2) ◽  
pp. 267-278
Author(s):  
G.Yu. Yamskikh ◽  
A.V. Kozhukhovsky ◽  
K.V. Marusin ◽  
E.A. Fedorova
Keyword(s):  
Economic Activity ◽  
Similar Type ◽  
Coastal Processes ◽  
The Past ◽  
The Reformation ◽  
Long Term Monitoring ◽  
Verification Of Models ◽  
The Village ◽  
Term Monitoring

The article presents the analysis and prediction of coastal processes at the site of the Krasnoyarsk reservoir in the village of Kurtak where there are the most intensive processes of coastal reshaping. Over the past 50 years, the coast has receded here by an average of 350 m and continues to actively collapse at a speed of 3-5 m per year. Despite the fact that the intensity of coastal processes in this area has significantly decreased (mainly due to the general decrease in the level of the Krasnoyarsk reservoir), the rate of retreat of the shore is still high. However, it can be concluded that for the researched area the coastal reshaping does not pose a real threat to economic activity in the next 30 years. The article tested various methods of forecasting coastal processes, selected the most appropriate for the shores of a similar type. Verification of models was carried out on the basis of data of long-term monitoring of the site under consideration, which gave the chance to compare results of forecasts on different techniques to real retreat of the coast on this site.

scholarly journals Effects of waves and currents on the siltation problem of Damietta harbour, Nile Delta coast, Egypt

2007 ◽  
Vol 8 (2) ◽  
pp. 33 ◽  
Author(s):  
ABO BAKER.I. ABO ZED
Keyword(s):  
Sediment Transport ◽  
Nile Delta ◽  
Monitoring Program ◽  
Wave Direction ◽  
Littoral Drift ◽  
Wave Refraction ◽  
The North ◽  
Dynamic Factors ◽  
Navigation Channel ◽  
Nile Delta Coast

This study evaluates the effect of prevailing dynamic factors on the sedimentation process in Damietta Harbour along the Nile delta coast of Egypt. The monitoring program spanned the period between 1978 and 1999 and included measurements of waves, currents and bathymetric profiles. The evaluation was based on determination of erosion and accretion rates, current regime, sediment transport, wave characteristics and wave refraction. Results revealed that the predominant wave direction from N-NW sector (86 %) throughout the year is responsible for generation of a longshore eastward current. Less frequent waves from the N-NE sector generate an opposing longshore westward current. The refraction pattern for the prevailing wave direction indicates that the harbour and its navigation channel are located within a divergence of wave orthogonal and in an accretion sediment sink area. The annual net rate of littoral drift on the western side of the harbour is about 1.43 * 105 m3 (accretion), while the annual net rate of littoral drift on the eastern side is about 2.54 * 105 m3 (erosion). Currents fluctuate tremendously in speed and direction, especially during the winter months. Hence, sediment transport takes place in offshore, eastward, and onshore directions. Progressive vector diagrams show that the largest near bottom offshore, onshore and easterly net drift occurs during summer, spring and winter respectively. The onshore sediment transport generated during spring and summer plays an important role in the redistribution of eroded sediments during the winter. The overall study of dynamic factors indicated that the harbour site is characterized by eastern, western, offshore and onshore sediment movements. Therefore, the north-south orientation of the navigation channel, with its depth greater than the surrounding area, interrupts sediment drift from different directions and reduces the current speed. Consequently, the sediments sink within the navigation channel from different directions. The sources of sediments contributing to the siltation process of the harbour and its navigation channels are mainly derived from the Rosetta promontory, Burullus beaches, Damietta promontory and from offshore and the dumping area.

Predynastic human presence discovered by core drilling at the northern Nile delta coast, Egypt

Geology ◽  
2008 ◽  
Vol 36 (8) ◽  
pp. 599 ◽  
Author(s):  
Jean-Daniel Stanley ◽  
Thomas F. Jorstad ◽  
Maria Pia Bernasconi ◽  
Dennis Stanford ◽  
Margaret Jodry
Keyword(s):  
Nile Delta ◽  
Core Drilling ◽  
Human Presence ◽  
Nile Delta Coast

scholarly journals LONGSHORE CURRENTS AND WAVES AT BURULLUS COAST

1974 ◽  
Vol 1 (14) ◽  
pp. 39
Author(s):  
M. Manohar ◽  
I.E. Mobarek ◽  
A. Morcos
Keyword(s):  
Nile Delta ◽  
Current Data ◽  
Radiation Stress ◽  
Longshore Currents ◽  
Littoral Current ◽  
Nile Delta Coast ◽  
Semi Empirical ◽  
Best Fit ◽  
Comprehensive Studies

Littoral currents within the breaker zone and currents other than those induced by waves beyond the breaker zone exist with considerable magnitude along the Nile Delta coast. Analysis of the littoral currents within the breaker zone by four semi-empirical formulae involving energy, momentum and radiation stress principles indicates good correlation between predicted and observed velocities. Galvin-Eagleson approach gives the best fit. Current data are statistically analysed enabling the determination of the magnitude, direction and percentage of occurrence of any particular littoral current for any particular period. More comprehensive studies of the currents climate within the breaker zone and beyond the breaker zone for the entire Nile Delta coast covering a large number of years are under way,

scholarly journals THE NILE DELTA C0ASTA1 PROTECTIOH PROJECT

1972 ◽  
Vol 1 (13) ◽  
pp. 74
Author(s):  
Ismail E. Mobarak
Keyword(s):  
Nile Delta ◽  
Laboratory Studies ◽  
Planning And Design ◽  
Long Term Study ◽  
Extensive Field ◽  
Severe Erosion ◽  
Nile Delta Coast ◽  
Sea Wall ◽  
The 19Th Century ◽  
Ras El Bar

The Nile Delta Coast on the Mediterranean Sea was formed through many centuries. The two existing main branches of the River Nile, i.e. Rosetta and Damietta, succeeded over the ages in forming two peninsulas or protrusions in the sea. By the end of the 19th century erosion started at several important points of the coast, causing damages to the national economy, either directly or indirectly. This erosion has increased tremendously during the last decade. Several field and laboratory studies were carried out during the last few years, concentrating on the severely attacked areas, such as Ras-EL-Bar, Burullas, Rosetta,Maadia. Based on the quick field and laboratory studies, remedial constructions are designed for the locations of severe erosion* Groins for Ras-El-Bar with artificial sand feeding and stone pitching and a wall for the Damietta estuary. A large groin for Burullos outlet which developed some advantageous changes even before finishing its execution,, and sea wall for Maadia. All the above projects are discussed and explained. A long term study project was started early in 1971 to collect the data necessary for a better understanding of the problem. The aims of this project are as follows: (1) To determine the historical formation of the Delta and forecasting future changes ; (2) Study the Meteorology and the Hydrodynamics of the area ; hindcasting and starting a new forecasting technique for them; (3) Planning and design of protective constructions for the coast is to be gained. All the above will be based on an extensive field data collection programme, mathematical models and hydraulic scale models. 1409

scholarly journals Proximate Composition, Bioactive Compounds, and Antioxidant Potential of Wild Halophytes Grown in Coastal Salt Marsh Habitats

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 28
Author(s):  
Yasser A. El-Amier ◽  
Walid Soufan ◽  
Khalid F. Almutairi ◽  
Nouf S. Zaghloul ◽  
Ahmed M. Abd-ElGawad
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Proximate Composition ◽  
Nutritive Value ◽  
Nile Delta ◽  
Soluble Sugars ◽  
Forage Production ◽  
Coastal Salt Marsh ◽  
Total Carbohydrates ◽  
Nile Delta Coast

Halophytes have been characterized as a potential resource for fiber, food, fodder, and bioactive compounds. Proximate composition, bioactive compounds, and antioxidant activity of five wild dominant halophytes (Arthrocnemummacrostachyum, Halocnemumstrobilaceum, Limoniastrummonopetalum, Limoniastrumpruinosum, and Tamarix nilotica) naturally growing along the Nile Delta coast were assessed. The soil supporting these halophytes was sandy to sand-silty, alkaline, with low organic carbon, and relatively high CaCO3. H. strobilaceum attained the highest moisture content, ash, crude fiber, lipids, and total soluble sugars. L. monopetalum showed the highest content of crude protein (18.00%), while T. nilotica had the highest content of total carbohydrates. The studied halophytes can be ranked according to their nutritive value as follows: H.strobilaceum > L.monopetalum > A.macrostachyum > L.pruinosum > T. nilotica. A. macrostachyum attained the highest amount of Na+, K+, Ca2+, and Mg2+. A. macrostachyum showed a high content of phenolic compounds, while H.strobilaceum was rich in tannins and saponin contents. The MeOH extract of A. macrostachyum and H. strobilaceum exhibited substantial antioxidant activity. The present results showed that the studied halophytes could be considered as candidates for forage production or used as green eco-friendly natural resources for bioactive compounds.

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