Assessment of the vulnerability of zemmouri bay to coastal erosion, diachronic study between 1957 and 2017

The analysis and understanding of coastline variability and coastal erosion trends, and accretion are essential to scientists and local decision-makers to guide shoreline management regulations and decisions. This study focuses on detecting and analyzing historical changes in the Zemmouri (Central Algeria) shoreline position between 1957 and 2017. We collected all the necessary data related to the Zemmouri bay to achieve our objective, such as satellite images, aerial photos, and topographical surveys carried out by the DGPS, all between 1957 and 2017 DSAS calculation tool.

Diachronic analysis of aerial photographs and satellite images of Zemmouri Bay revealed that only 39% of sandy beaches are eroding while 3% have some stability. The maximum erosion at Mazer East beach is -1.25m/year. The maximum accretion rate of +1.40m/year at Blue Waves beach, mainly due to the implantation of breakwaters at this beach which created tombolos favoring sand accumulation and beach widening.

Mapping aquatic vegetation of the Rakamaz-Tiszanagyfalui Nagy-Morotva using hyperspectral imagery

Rapid development in remote sensing technologies provides more and more reliable methods for environmental assessment. For most wetlands, it is difficult to walk-in without disturbing the endangered species living there; therefore, application of opportunities provided by remote sensing has a great importance in population-mapping. One effective tool of vegetation pattern estimation is hyperspectral remote sensing, which can be used for association and species level mapping as well, due to high ground resolution. The Rakamaz-Tiszanagyfalui Nagy-morotva is an oxbow lake, located in the north-eastern part of Hungary. For this study, a wetland area of 1.17 km2 containing the original water bad and shoreline was selected. For the image analysis, images taken by an AISA DUAL system hyperspectral sensor were used. At the same time, 7 main vegetation classes were separated, which are typical for the sample plot designated on the test site. Classification was performed by the master areas signed by the most common associations of the Rakamaz-Tiszanagyfalui Nagy-morotva with determined spectrums. During the image analysis, SAM classification method was used, where radian values were optimized by the results of classification performed at the control area.

Integrating applied lake ecology into spatial planning: towards a socially acceptable lakeshore restoration at Lake Velence (Hungary)

A good chance of a socially accepted shore-restoration that is sustainable for the long run stands only, if all those, concerned in lake-use, are also interested in the ecological interventions, if shore-restoration serves social and economic purposes, as well. In the previous phase of our research, assessments were made to find the sections of the shore zone that are suitable for restoration: to detect the sites where the existing artificial shoreline stabilization works could be removed. So that social demands should be involved in the assessment process, to begin with, structured interviews were made. According to the results, the share of the plots, being suitable or partially suitable for shore-restoration, slightly exceeded 7%. The analysis of restoration’s limiting factors has shown that the type of shoreline stabilization, the width of zone covered by emergent macrophytes, the extent of human pressures, and the relevant regulations on zoning (fixed in urban plans) together set limits to restoration. The interviews have made it clear that as a result of the changed demands on recreation-tourism, also the natural and landscape values have become more significant

Public perceptions and aesthetic preferences of lakeshore landscape: the example of Lake Velence (Hungary)

Earlier, intervention programs and tourism development projects in the lakeside area of Lake Velence have led to the diversification of lakeshore landscape and shoreline. In the current study, we investigated the public aesthetic preferences of varying lakeshore landscapes, driving factors (which cause preference deviation and visual discomfort), and judgments of perceived beauty of 14 lakeshore scenes. The study also examined the differences in preferences of lakeshore landscapes between experts and waterfront residents. The results indicated that landscape characteristic and maintenance state have a significant impact on the receptor’s preference. In the investigation of lakeside landscape preference with different natural degrees, both the near-natural lakeshore and the natural lakeshore are lacking attention and attraction. Though natural (“wild”) lakeshore beneficial to the birds and other wildlife, overgrown riparian / aquatic plants and rigid shoreline caused visual fatigue and boredom feel. These findings provide a reference for the forthcoming lakeside intervention projects and land-use decisions.