scholarly journals Morphodynamics of the south Baltic seabed in the remote nearshore zone in the light of field measurements

2021 ◽  
pp. 106546
Author(s):  
Magdalena Stella
Keyword(s):  
Field Measurements ◽  
Nearshore Zone ◽  
The South

scholarly journals STEADY FLOWS IN THE NEARSHORE ZONE

1984 ◽  
Vol 1 (19) ◽  
pp. 153
Author(s):  
John W. Haines
Keyword(s):  
Vertical Structure ◽  
Field Measurements ◽  
Steady Flows ◽  
Nearshore Zone

Field measurements using electronmagnetic flowmeters on two natural beaches are presented. Mean flows are compared to theory. The horizontal and vertical structure are discussed.

Evaluation of the impact from the discharge of treated sewage on the south-east Saronicos Gulf through mathematical water quality modelling

1999 ◽  
Vol 39 (8) ◽  
pp. 63-70
Author(s):  
C. Noutsopoulos ◽  
E. Gavalaki ◽  
A. Andreadakis
Keyword(s):  
Biological Treatment ◽  
Critical Factor ◽  
Field Measurements ◽  
Substantial Improvement ◽  
Disposal Site ◽  
The South ◽  
Treated Sewage ◽  
Limiting Nutrient ◽  
The Impact

The paper presents the results of a study of the impact caused by the discharge of treated sewage from the south-west Attiki area to the south-east coast of the Saronicos Gulf. The study involved the application of a eutrophication-dissolved oxygen model which, following validation on the basis of field measurements, was applied to predict the impact of three different biological treatment configurations, with and without nutrients removal, as well as three alternative disposal sites on the quality of the receiving waters. The simulation results show that nitrogen is the limiting nutrient and that its removal during treatment results in a substantial improvement of the quality of the recipient. The disposal site is a critical factor in the case of a biological treatment scheme exhibiting carbon removal, but it is of limited importance in the case of treatment systems with nitrogen removal.

scholarly journals Dynamics of the Land–Sea Breeze System and the Surface Current Response in South-West Australia

2020 ◽  
Vol 8 (11) ◽  
pp. 931
Author(s):  
Syeda Rafiq ◽  
Charitha Pattiaratchi ◽  
Ivica Janeković
Keyword(s):  
Surface Current ◽  
Field Measurements ◽  
Sea Breeze ◽  
Wind Forcing ◽  
Current Response ◽  
Surface Currents ◽  
The South ◽  
Wind Speeds ◽  
North East ◽  
South West

The land–sea breeze (LSB) system, driven by the thermal contrast between the land and the adjacent ocean is a widely known atmospheric phenomenon, which occurs in coastal regions globally. South-west Australia experiences a persistent and one of the strongest LSB systems globally with maximum wind speeds associated with the LSB system often exceeding 15 ms−1. In this paper, using field measurements and numerical simulations, we examine: (1) the local winds associated with the land–sea breeze with an emphasis on the ocean; and, (2) the response of the surface currents to the diurnal wind forcing. The measurements indicated that the wind speeds decreased between midnight and 0400 and increased rapidly after 1100, reaching maxima >10 ms−1 around 1800) associated with the sea breeze and decreased to midnight. Wind directions were such that they were blowing from south-east (120°) in the morning and changed to almost southerly (~200°) in the afternoon. Decomposition of the wind record to the diurnal and synoptic components indicated that the diurnal component of winds (i.e., LSB) was oriented along the south-west to north-east axis. However, the stronger synoptic winds were from the south-east to south quadrant and in combination with the LSB, the winds consisted of a strong southerly component. We examined the evolution, horizontal extent, and propagation properties of sea breeze fronts for characteristic LSB cycles and the sea breeze cell propagating offshore and inland. The results indicated that the sea breeze cell was initiated in the morning in a small area, close to 33° S, 115.5° E, with a width of ~25 km and expanded onshore, offshore and alongshore. The sea breeze cell expanded faster (30 kmh−1) and farther (120 km) in the offshore direction than in the onshore direction (10 kmh−1 and 30–40 km). Winds during the LSB cycle followed a counterclockwise rotation that was also reflected in the surface currents. The winds and surface currents rotated anticlockwise with the surface currents responding almost instantaneously to changes in wind forcing but were modified by topography. The diurnal surface currents were enhanced due to the resonance between the LSB forcing and the inertial response.

scholarly journals Field measurements of Tropical Storm Aere (1619) via airborne GPS ‐dropsondes over the South China Sea

2020 ◽  
Vol 27 (5) ◽  
Author(s):  
J. Y. Fu ◽  
Z. R. Shu ◽  
Q. S. Li ◽  
P. W. Chan ◽  
K. K. Hon ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Field Measurements ◽  
Tropical Storm ◽  
The South China Sea ◽  
The South ◽  
China Sea

Low frequency ambient noise modeling and comparison with field measurements in the South China Sea

2019 ◽  
Vol 148 ◽  
pp. 34-39 ◽  
Author(s):  
JianBo Zhou ◽  
Minhui Zhang ◽  
ShengChun Piao ◽  
Kashif Iqbal ◽  
Ke Qu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Ambient Noise ◽  
Low Frequency ◽  
Field Measurements ◽  
The South China Sea ◽  
The South ◽  
Noise Modeling ◽  
China Sea

scholarly journals Seawater intrusion assessment and prediction of sea-freshwater interface in Parangtritis coastal aquifer, South of Yogyakarta Special Province, Indonesia

2021 ◽  
Vol 8 (3) ◽  
pp. 2709-2718
Author(s):  
Wahyu Wilopo ◽  
R Risanti ◽  
Raja Susatio ◽  
Doni Prakasa Eka Putra
Keyword(s):  
Seawater Intrusion ◽  
Major Ions ◽  
Chloride Concentration ◽  
Shallow Groundwater ◽  
Field Measurements ◽  
Research Area ◽  
Geological Structure ◽  
The South ◽  
Unconfined Aquifers ◽  
Groundwater Samples

The Parangtritis area is a tourist destination in Yogyakarta, Indonesia, consisting of dunes and plains. One of the essential parameters in tourist areas is the provision of water sources. The increase in tourist visits and the development of tourism facilities in this area have increased groundwater utilization. Therefore, this study aims to assess the potential of seawater intrusion in the Parangtritis Beach area and its surroundings, Indonesia. The research was carried out by surveying, field measurements, and groundwater samples to test major ions in the laboratory. Indications of seawater intrusion are based on TDS values, Cl-, Simpson ratio, Sodium Chloride ratio, BEX, and groundwater type. The results showed that the research area had a shallow groundwater level with groundwater flow relative to the south-southwest and composed of unconfined aquifers. Only two water samples indicate seawater intrusion from Parangwedang spring and its southern place based on the geochemical analysis. However, this spring was formed due to geological structure related to geothermal manifestation and not due to seawater intrusion. It has a lateral flow to the south and is mixed with shallow groundwater, thereby increasing the chloride concentration in the groundwater. The sea-freshwater interface has a depth from 52 meters to 284 meters from sea level, where the farther from the coastline, the more profound.

Wind Influence on the Formation of Nearshore Currents in the Southern Baltic: Numerical Modelling Results

2012 ◽  
Vol 59 (1-2) ◽  
pp. 37-48 ◽  
Author(s):  
Andrei Sokolov ◽  
Boris Chubarenko
Keyword(s):  
Field Measurements ◽  
Wave Transformation ◽  
Nearshore Zone ◽  
Field Station ◽  
Longshore Currents ◽  
Baltic Proper ◽  
Wind Influence ◽  
Southern Baltic ◽  
The Baltic ◽  
Drift Component

Abstract A two-dimensional numerical model was used for a simulation of vertical average longshore currents generated by both wind friction and wind-wave action in the nearshore zone. The modelling domain includes the southern part of the Baltic Proper (all boundaries were closed). Wind, uniform in space and varying in time, was the only forcing in the model. The correlation coefficient higher than 0.8 was obtained by model calibration versus the field measurements of currents conducted at the Lubiatowo field station (southern Baltic) during about 1.5 months in 2006. Comparative simulations of total currents including both wind-induced drift and wave components, and of total currents including only a wind-induced drift component, showed that the input of the drift component into currents in the nearshore zone is greater than commonly believed.Wind-induced drift strongly dominates outside the zone of wave transformation, and its input into the total resulting currents remains noticeable even in a zone between the shoreline and the depth of the first wave breaking. Thus, wind-induced drift constitutes up to 50% of the resulting longshore currents for longshore winds and no less than 20% of the longshore component of currents for winds at 45 degrees to the longshore direction.

scholarly journals Glaciological settings and recent mass balance of Blåskimen Island in Dronning Maud Land, Antarctica

2017 ◽  
Vol 11 (6) ◽  
pp. 2883-2896 ◽  
Author(s):  
Vikram Goel ◽  
Joel Brown ◽  
Kenichi Matsuoka
Keyword(s):  
Mass Balance ◽  
Field Measurements ◽  
The South ◽  
Ice Shelf ◽  
Surface Mass ◽  
The Past ◽  
The North ◽  
Dronning Maud Land ◽  
North Western ◽  
Method Show

Abstract. The ice-shelf-fringed coast of Dronning Maud Land in East Antarctica contains numerous ice rises that influence the dynamics and mass balance of the region. However, only a few of these ice rises have been investigated in detail. Here, we present field measurements of Blåskimen Island, an isle-type ice rise adjacent to Fimbul Ice Shelf. This ice rise is largely dome shaped, with a pronounced ridge extending to the south-west from its summit (410 m a.s.l.). Its bed is mostly flat and about 100 m below the current sea level. Shallow radar-detected isochrones dated with a firn core reveal that the surface mass balance is higher on the south-eastern (upwind) slope than on the north-western (downwind) slope by ∼ 37 %, and this pattern has persisted for at least the past decade. Moreover, arches in radar stratigraphy suggest that the summit of the ice rise has been stable for ∼ 600 years. Ensemble estimates of the mass balance using the input–output method show that this ice rise has thickened by 0.12–0.37 m ice equivalent per year over the past decade.

scholarly journals A comparison of glacier melt on debris-covered glaciers in the northern and southern Caucasus

2011 ◽  
Vol 5 (1) ◽  
pp. 431-459 ◽  
Author(s):  
A. Lambrecht ◽  
C. Mayer ◽  
W. Hagg ◽  
V. Popovnin ◽  
A. Rezepkin ◽  
...  
Keyword(s):  
Field Experiments ◽  
Field Measurements ◽  
Special Focus ◽  
European Alps ◽  
The South ◽  
The Caucasus ◽  
Ice Melt ◽  
The North ◽  
Debris Cover ◽  
Southern Caucasus

Abstract. The glacier coverage in the Caucasus Mountains underwent considerable changes during the last decades. Besides a reduction in glacier area which in some areas is comparable to area changes in the European Alps, also the concentration of supra-glacial debris increased on many glaciers. Only a few glaciers in the Caucasus are monitored on a regular basis, while for most areas no field measurements are available on a continuous basis. In this study the regional differences between the well studied Adyl-su basin on the northern slope of the Caucasus is compared with a similar basin in the South (Zopkhito basin). Special focus is laid on the effect of supra-glacial debris cover on the melt conditions during the ablation season. Systematic differences can be shown for the distribution and temporal increase of the debris cover on the glaciers. While in the Adyl-su basin an extensive debris cover on the glacier tongues is common, only some low lying glacier tongues in the Zopkhito basin show considerable supra-glacial debris. Also the temporal increase in debris cover is decidedly stronger in the North. Field experiments show that the thermal resistance of the debris cover is somewhat higher than in other glacerised regions in the world. A simple ablation model which includes the effect of the debris cover on ice melt indicates considerably stronger melt rates in the northern basin, despite the much more widespread debris distribution. This is due to the different meteorological conditions with more frequent cloud cover and precipitation in the South. Still ablation is strongly influenced in both basins by the occurrence of supra-glacial debris cover, reducing the total amount of melt on the glacier by about 20%. Especially in the lower tongue areas this effect mitigates the area loss of the glaciers considerably.

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