VULNERABILITY TO CHANNEL MIGRATION OF THE NIRAJ RIVER

Vulnerability to channel migration of the Niraj river. The aim of this paper is to analyze the changes in the geometrical characteristics of the Niraj river. In order to determinate the zone exposed to the migration of the river we tried to identify the channel migration zone and we study the historic migration zone base on a composite area defined by the channel location in 1910, 1960, 2008, so we obtained the zone of channel occupation for a 100 years’ timeframe. Therefore, for delineating the channel migration we digitized polygons for the bank full channel for each time series, and merge them in the same polygon. For anticipated future migration beyond the historic corridor boundary, we added to the channel migration zone an erosion polygon, based on the geological, and land-use characteristics. As a result we obtain a complex set of data which will allow for practitioners to use it in different contexts like: to predict the rate and extend of meander migration, evaluating the risk to existing facilities - necessaries for design countermeasures against the negative effects

The geological and paleontological heritage of Manresa municipality (Catalonia, Spain)

A preliminary inventory of 14 points of geological interest has been carried out in the Manresa municipality (Barcelona, Catalonia, Spain). All the rocks within this area belong to the sedimentary infill of the Ebro basin that took place during the Eocene. The municipality is relatively small and contains a relevant heritage of of sedimentology, paleontology and, to a lesser extent, geomorphologic and structural. The proposal of points of geological interests includes several relatively small outcrops that display: geomorphology (a rock bridge), two sedimentary structures (a slump and cross bedding), clastic sedimentology, a reef, faults, joints, and two fluvial 394 terraces. Another point combines geomorphology, sedimentology and mineralogy. Finally, the relatively larger Malbalç geozone is the most remarkable point and includes paleontology, sedimentology, geomorphology and ancient quarrying. In 1926 this zouctural.ne was visited as part of the XIV International Geological Congress. The whole set of points of geological interest are ideal to teach geology for the divulgative to academic level.Peer ReviewedPostprint (published version

River channel response to runoff variability

International audienceThe focus of this study was to determine river runoff impacts on channel evolution during the last centuries. Comparing a number of maps from the 18th?21th centuries and space images in concert with hydrological data we estimated natural trends, cycles and the intensity of channel formation for periods of high and low runoff. Our analysis for a long period of time enable us assessing mean and maximum rates of erosion and accumulation of river channels and bank dynamics under different conditions. Using links between runoff values and meander size we predict and reconstruct these for several Russian rivers. For forecast validation we use cases of high scale runoff change ? water transfer from one basin to another

The Sediments Flow of the Main Baikal Rivers and Its Sensitivity to the Environmental Change (East Siberia, Russia)

The results of the analysis of water and sediments flows’ changes of main inflowing Baikal rivers over the observation period are presented. Long-term observation record of sediments flow is divided into two periods differ with average values and a scale fluctuations of annual averages values. During the first period dynamics of sediments flow of rivers is determined by hydro-climatic factors, i.e. fluctuations of sediments flow, in general, are synchronous to fluctuations of water flow. During the second period (from the second half of 1970s) there is the downward trend of sediments flow’s change (decrease by 48 – 81%) against the background of increased water content of rivers. This trend is caused by both anthropogenic influence in basins of rivers under review and natural processes, connected to global and regional changes of climatic characteristics. In general, natural processes of sediments flow’s changes in the different areas of Baikal basin are adjusted by anthropogenic factors to a greater or lesser extent. The present article can be used as information and analytical material for the further research and forecast of sediments flow’s changes in Baikal basin as well as in other rift-valley lakes of the world. Keywords: Lake Baikal, water and sediments flow, trends, antropogenic factor, climate chang

Geomatics for Integrated Coastal Zone Management: multitemporal shoreline analysis and future regional perspective for the Portuguese Central Region

Shoreline mapping and change detection are critical for Integrated Coastal Zone Management (ICZM) and all that it represents. This research utilized previous studies that combined both Remote Sensing and Geographical Information System (GIS) techniques to assess, map and forecast shoreline evolution from short-term perspectives. The study area is located in the central region of Portugal, between the counties of Ovar and Marinha Grande (circa 140 km) and the time period assessed was from 1984 to 2011. Historical data were used to calculate advance and retreat rates in order to support environmental scenarios for the Portuguese Central Region’s Coastal Management Plan. To ensure accuracy, a repeatable procedure was validated using Landsat TM and ETM+ satellite images, which were subsequently enhanced and elaborated by Remote Sensing analyses to detect and extract shorelines. They were subsequently integrated within an Esri ArcGIS software application (DSAS - Digital Shoreline Analysis System) to determine and predict rates of coastline change. Graphical DSAS plots identified coastline phases and shifts and were used to simulate the 2022 coastline scenario. These results will be integrated into the Coastal Zone Management Plan (Horizon – 2022). Importantly this methodological planning approach provides visual coastline change information for regional decision-makers and stakeholders

DINAMIKA FISIK PESISIR KAWASAN WISATA PANTAI GUMUMAE KABUPATEN SERAM BAGIAN TIMUR PROVINSI MALUKU

Sebagai salah satu destinasi wisata bahari, pantai Gumumae menjadi lokasi liburan potensial bagi masyarakat Kota Bula dan sekitarnya. Memiliki luas 19.70 ha membantang dari Teluk Sesar sampai Sungai Wailola, turut berkontribusi pada pembentukan struktur dan karakteristik pantai. Dinamika fisik pesisir yang kompleks menjadi tujuan penelitian dilakukan. Harapannya pengelolaan Pantai Gumumae sebagai kawasan wisata bahari dapat dilakukan secara tepat dan berkelanjutan. Penelitian dilakukan pada bulan September sampai Oktober 2019, di Pantai Gumumae Kabupaten Seram Bagian Timur Provinsi Maluku. Pengamatan parameter fisik pesisir dilakukan secara insitu dan komparasi data penginderaan jauh, melalui satelit altimetri NASATOPEX/Poseidon, Jason-1/Envisat, dan Jason-2/Envisat tanggal 2 - 17 September 2019. Menggunakan analisis deskriptif kuantitatif, spasial dan temporal melalui citra satelit Landsat 8 dan arcgis imagery 2019, untuk mengetahui pengaruh dinamika fisik dalam bentuk peta tematik. Pantai Gumumae merupakan dataran rendah tetapi dikelilingi wilayah perbukitan disekitarnya. Pola curah hujan berfluktuasi dalam setahun, namun terdapat trend peningkatan sejak bulan September sampai November dan berdampak pada aliran sungai, tidak mengherankan transport sedimen yang dialirkan ke pesisir pantai Gumumae melalui muara sungai Wailola berada dalam jumlah yang besar. Termasuk kategori perairan dangkal dengan kedalaman 45 cm sampai 2.5 meter pada jarak >15 meter dari garis pantai ke arah laut. Tinggi gelombang relatif kecil yakni sebesar 0.68 meter – 0.82 meter, namun memiliki arus yang cenderung cepat di muara sungai Wailola. Anomali permukaan laut di pesisir Gumumae mengalami penurunan secara konstan sebesar 3mm sampai 116 mm. Kecepatan arus dan sudut elevasi perairan pantai mengalami fluktuasi sehingga memberi pengaruh pada arah dan kekuatan arus pantai, gelombang kecil, sedimentasi tinggi di muara hingga sebagian kawasan wisata. Perlu perencanaan yang komprehensif untuk pengelolaan wisata pantai Gumumae berdasarkan kesesuaian tata ruang. As one of the marine tourism destinations, Gumumae beach is a potential vacation area for the people of the city of Bula and its surroundings. It has an area of 19.70 ha stretching from the Sesar bay to the Wailola river, contributing to the formation of the structure and characteristics of the coastal. The complex physical dynamics of the coastal is the aim of the study. It is hoped that the management of Gumumae beach as a marine tourism area can be carried out appropriately and sustainably. The study was conducted from September to October 2019, on the coastal of Gumumae, East Seram Regency, Maluku Province. Observation of coastal physical parameters was carried out insitu and compared remote sensing data, via satellite altimetry NASATOPEX / Poseidon, Jason-1 / Envisat, and Jason-2 / Envisat on 2-17 September 2019. Using quantitative descriptive analysis, spatial and temporal through satellite imagery. Landsat 8 and Arcgis Imagery 2019, to determine the effect of the physical dynamics of the Gumumae coastline in the form of thematic maps. Gumumae Beach is a low-lying area but is surrounded by hilly areas around it. Rainfall patterns fluctuate within a year, but there is a trand increase from September to November and have an impact on river flow, it is not surprising that sediment transport flowed to the coastal of Gumumae via the Wailola river mouth is in large numbers. Current velocity and elevation angle of coastal waters fluctuate so that it influences the direction and strength of coastal currents. Included in the category of shallow water with a depth of 45 cm to 2.5 meters at a distance of> 15 meters from the coastline towards the sea. The wave height is relatively small at 0.68 meters - 0.82 meters, but has a current that tends to be fast at the mouth of the Wailola river. Sea level anomalies on the coastal of Gumumae are constantly decreasing by 3mm to 116 mm. Need a comprehensive planning for the management of Gumumae beach tourism based on spatial suitability. As one of the marine tourism destinations, Gumumae beach is a potential vacation area for the people of the city of Bula and its surroundings. It has an area of 19.70 ha stretching from the Sesar bay to the Wailola river, contributing to the formation of the structure and characteristics of the coastal. The complex physical dynamics of the coastal is the aim of the study. It is hoped that the management of Gumumae beach as a marine tourism area can be carried out appropriately and sustainably. The study was conducted from September to October 2019, on the coastal of Gumumae, East Seram Regency, Maluku Province. Observation of coastal physical parameters was carried out insitu and compared remote sensing data, via satellite altimetry NASATOPEX / Poseidon, Jason-1 / Envisat, and Jason-2 / Envisat on 2-17 September 2019. Using quantitative descriptive analysis, spatial and temporal through satellite imagery. Landsat 8 and Arcgis Imagery 2019, to determine the effect of the physical dynamics of the Gumumae coastline in the form of thematic maps. Gumumae Beach is a low-lying area but is surrounded by hilly areas around it. Rainfall patterns fluctuate within a year, but there is a trand increase from September to November and have an impact on river flow, it is not surprising that sediment transport flowed to the coastal of Gumumae via the Wailola river mouth is in large numbers. Current velocity and elevation angle of coastal waters fluctuate so that it influences the direction and strength of coastal currents. Included in the category of shallow water with a depth of 45 cm to 2.5 meters at a distance of> 15 meters from the coastline towards the sea. The wave height is relatively small at 0.68 meters - 0.82 meters, but has a current that tends to be fast at the mouth of the Wailola river. Sea level anomalies on the coastal of Gumumae are constantly decreasing by 3mm to 116 mm. Need a comprehensive planning for the management of Gumumae beach tourism based on spatial suitability

A multisource approach for coastline mapping and identification of shoreline changes

Coastal dynamics are driven by phenomena of exogenous and endogenous nature. Characterizing factors that influence their equilibrium and continuous monitoring are fundamental for effective environmental planning and management of coastal areas. In order to monitor shoreline changes, we developed a methodology based on a multisource and multitemporal approach. A database, related to the Ionian coast of Basilicata region (about 50 km), was implemented by using cartographic data (IGMI data), satellite imagery (SPOT-PX/XS, Landsat-TM, Corona) and aerial data covering the period form 1949 to 2001. In particular, airborne data (1 m spatial resolution) were acquired during a specific campaign we performed in 2000 and 2001. To obtain the best performance from the available data, we applied a data fusion procedure on visible and thermal information. Different algorithms were tested, such as band ratios and clustering for extracting the coastline. The best results from multispectral data were obtained using a threshold algorithm we devised by exploiting the green, red and NIR bands, whereas for panchromatic data we selected clustering as the more suitable method. Moreover, a GPS survey was performed to evaluate the influence of tidal effects