scholarly journals Sand Dune Ridge Alignment Effects on Surface BRF over the Libya-4 CEOS Calibration Site

Sensors ◽  
2015 ◽  
Vol 15 (2) ◽  
pp. 3453-3470 ◽  
Author(s):  
Yves Govaerts
Keyword(s):  
Sand Dune ◽  
Dune Ridge

scholarly journals Fifteen years of habitat, floristic and vegetation change on a pioneer sand-dune and slack system at Ainsdale, north Merseyside, UK

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Philip Howard Smith ◽  
Patricia Lockford
Keyword(s):  
Vascular Plants ◽  
Sand Dune ◽  
Vegetation Change ◽  
Vegetation Types ◽  
Ellenberg Indicator Values ◽  
Low Salinity ◽  
Lower Fertility ◽  
Dune Ridge ◽  
Seasonally Flooded ◽  
Rate Of Succession

Changes in habitat, floristics and vegetation between 2005 and 2019 were studied on 2.9 ha of sandy foreshore near Ainsdale-on-Sea, north Merseyside. Named the ‘New Green Beach’, the site initially supported saltmarsh vegetation but, within five years, a 30-35 m-wide embryo dune ridge had formed, eventually 3.5 m high, backed by a 300 x 30 m seasonally flooded, calcareous dune-slack. The latter was colonised by pioneer slack plants, after which it rapidly developed areas of tall-herb fen and Alnus/Salix carr, while saltmarsh plants declined. During succession, species recorded as ‘rare’ became fewer in number while a higher frequency of ‘abundant’ taxa was recorded. The number of vascular plants listed annually increased from one in 2005 to 154 in 2019, though the rate of addition of new plants fell after 2010. Overall, 246 taxa were identified during the study. Only 9% of these were non-native, 17% being regionally or nationally notable, including 16 Red-listed species. Very poor statistical fits were obtained to recognised UK National Vegetation Classification vegetation types. Analysis of Ellenberg Indicator Values for salinity, nitrogen, moisture and reaction showed that the plant community became progressively adapted to low salinity, lower fertility, drier conditions and a less basic soil. The findings are discussed in relation to comparable studies elsewhere in Britain and Northern Europe. The rate of succession on the New Green Beach seems remarkably high, while evidence of declining soil fertility over time was unexpected.

scholarly journals Comparison of two Satellite Imaging Platforms for Evaluating Sand Dune Migration in the Ubari Sand Sea (Libyan Fazzan)

2015 ◽  
Vol XL-7/W3 ◽  
pp. 1375-1380 ◽  
Author(s):  
A. Els ◽  
S. Merlo ◽  
J. Knight
Keyword(s):  
Sand Dune ◽  
Mean Squared Error ◽  
Sand Dunes ◽  
Satellite Imaging ◽  
Climate And Environmental Change ◽  
Sensing Platforms ◽  
Multi Temporal ◽  
Image Overlay ◽  
Crest Line ◽  
Dune Ridge

Sand dunes can change location, form or dimensions depending on wind direction and strength. Sand dune movements can be effectively monitored through the comparison of multi-temporal satellite images. However, not all remote sensing platforms are suitable to study sand dunes. This study compares coarse (Landsat) and fine (Worldview) resolution platforms, specifically focussing on sand dunes within the Ubari Sand Sea (Libya). Sand dune features (crest line, dune ridge basal outlines) were extracted from Landsat and Worldview 2 imagery in order to construct geomorphic maps. These geomorphic maps were then compared using image overlay and differencing, and the Root Mean Squared Error (RMSE) was used to determine if the mapped dune patterns were significantly different. It was found that Landsat is a sufficient data source when studying dune patterns within a regional sand sea, but smaller dunes identified from Worldview data were not capable of being extracted in the data sourced from Landsat. This means that for studies concerned with the dune patterns and movements within sand seas, Landsat is sufficient. But in studies where the specific dynamics of specific dunes are required, a finer resolution is required; platforms such as Worldview are needed in order to gain more detailed insight and to link the past and present day climate and environmental change.

scholarly journals Geomorphological characteristics of the sand-dune field of the central Kyparissiakos Gulf

2007 ◽  
Vol 40 (4) ◽  
pp. 1530 ◽  
Author(s):  
Th. Karamousalis ◽  
S. Poulos ◽  
H. Maroukian ◽  
G. Ghionis
Keyword(s):  
Sand Dune ◽  
Sand Dunes ◽  
Fine Sand ◽  
Middle Part ◽  
Alluvial Fan ◽  
Last Glacial Period ◽  
Dune Field ◽  
Natural Processes ◽  
Dune Ridge ◽  
The Last Glacial

Sand dunes are sensitive coastal landforms closely related to the evolution (and/or stability) of the beach zone. The present work refers to the central part of the dune field that lies along the middle part of the shoreline of the Kyparissiakos Gulf. The scope of the present investigation is to reveal the geomorphological and sedimentological characteristics of the sand dune field in association with the natural processes contributing to their formation. On the basis of our findings, the dune field of the central Kyparissiakos Gulf consists of four dune ridges, with heights >4.0 m. Their extent indicates the availability of large quantities of sand and the existence of a rather stable wind field. They consist of well sorted medium to fine sand. The alluvial fan of the Zachareiko torrential river has covered the dune field in the area of its mouth and buried the oldest 4th dune ridge to its south. The development of the dune field is estimated to have taken place during the last 3-4 thousand years subsequently to the completion of the rapid sea level rise at the end of the last glacial period.

Nước dưới đất trong cồn cát ven biển phía nam Quảng Bình và định hướng khai thác sử dụng

2018 ◽  
Vol 28 (3) ◽  
pp. 336-345
Author(s):  
Nguyễn Xuân Tặng
Keyword(s):  
Sand Dune ◽  
Coastal Sand Dune ◽  
The South ◽  
Coastal Sand ◽  
Dune Area

Groundwater in coastal sand dune area in the south of Quang Binh province and posibility for exploitation

What habitat does spiny snout mite occupy in Tasmania

2015 ◽  
Vol 68 ◽  
pp. 446-446
Author(s):  
D.J. Wilson ◽  
P.J. Gerard
Keyword(s):  
New Zealand ◽  
Sand Dune ◽  
Biocontrol Agent ◽  
Predatory Mites ◽  
Mite Species ◽  
Predatory Mite ◽  
Habitat Specificity ◽  
Nontarget Organisms ◽  
Flea Control ◽  
Potential Biocontrol Agent

Spiny snout mite (Neomolgus capillatus) is a potential biocontrol agent for clover flea (Sminthurus viridis) a white clover pest on dairy farms in warmer and wetter parts of New Zealand In the 1990s this mite was introduced from Brittany France into Tasmania for clover flea control Results during the release programme were highly promising and subsequent anecdotal farmer reports indicate widespread decreases in damage As N capillatus is a predatory mite and already known to attack nontarget organisms habitat specificity will determine whether it could be introduced into New Zealand without risk to native insects To assess this pastures on nine of the original Tasmanian release farms and adjacent nontarget habitats ranging from bush wetlands eucalypt stands to sand dune country were sampled in April 2014 Litter samples were collected heat extracted and mite species identified Neomolgus capillatus was found at effective densities in pastures that had good clover cover Where present it displaced Bdellodes spp mites that are ineffective against clover flea No N capillatus were found in the nontarget habitats all of which lacked clover and contained other predatory mites including Bdellodes spp Therefore the preference by N capillatus for lush pastures makes it an excellent prospect for introduction as a biocontrol agent into clover flea prone regions of New Zealand

ACCUMULATION-DEFLATIONARY PROCESSES ON MARINE SAND BARS COASTS OF THE SOUTHERN-EAST BALTIC

2018 ◽  
Author(s):  
Е. Бадюкова ◽  
E. Badyukova ◽  
Леонид Жиндарев ◽  
Leonid Zhindarev ◽  
Светлана Лукьянова ◽  
...  
Keyword(s):  
Sand Bars ◽  
Marine Sand ◽  
Wave Erosion ◽  
Dune Ridge ◽  
Sea Wave ◽  
Sea Coast

Modern accumulative and deflation forms of a coastal eolian relief on the sea coast of Kuronian and Vistula Spits are considered. It is established that on coastal barriers there are at the same time processes of accretion and degradation of a dune ridge and leaned against it foredune. Alternation of stable and erosive sites of a dune ridge is revealed. The last has destruction signs as with sea (wave erosion), and from the land side where the whirls of a wind stream creating numerous deflation basins in dune ridge have great value.

Floristic patterns and ecological drivers of sand dune ecosystem along the Mediterranean coast of Egypt

2019 ◽  
Vol 33 (4) ◽  
pp. 388-411 ◽  
Author(s):  
Mohamed Abdelaal ◽  
Dalia Ahmed ◽  
Mauro Fois ◽  
Giuseppe Fenu ◽  
Gianluigi Bacchetta
Keyword(s):  
Sand Dune ◽  
Mediterranean Coast ◽  
Floristic Patterns ◽  
The Mediterranean

scholarly journals Coastal sand dune vegetation of Velika plaža (Montenegro)

2020 ◽  
Vol 79 (1) ◽  
pp. 43-54 ◽  
Author(s):  
Danijela Stešević ◽  
Filip Küzmič ◽  
Đorđije Milanović ◽  
Milica Stanišić-Vujačić ◽  
Urban Šilc
Keyword(s):  
Sand Dune ◽  
Sandy Beach ◽  
Field Work ◽  
Dune Vegetation ◽  
Sand Beach ◽  
New Associations ◽  
Comprehensive Survey ◽  
Sand Dune Vegetation ◽  
Phytosociological Study

Velika plaža (Ulcinj, Montenegro) is the largest sandy beach along the coast of the eastern Adriatic that still has well-developed sand-dune vegetation. Although the characterization of the flora and vegetation of Velika plaža has been addressed by many authors, knowledge on its vegetation remained poor. We made a phytosociological study of sand beach vegetation comprising both dunal and wetland areas to provide a comprehensive survey of sand dune vegetation and habitat typology of Velika plaža. Based on 149 relevés (both from literature and recent field work), and with numerical classification (Flexible beta) and ordination (Non-metric multidimensional scaling) our results show that the vegetation of Velika plaža is much more diverse than previously known. Altogether, 19 plant communities from 6 vegetation classes were identified. Among them we described two new associations: Cuscuto cesatianae-Phyletum nodiflorae and Onobrychido caput-galli-Vulpietum fasciculatae.

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