2012 IEEE/OES Baltic International Symposium (BALTIC)最新文献

Hindcast of sediment flow along the Curonian Spit under different wave climates 不同波浪气候下库尔斯沙咀沉积物流的后验图

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249195

M. Viška, T. Soomere

引用次数: 12

Trends of simulated oxygen dynamics and hypoxia in the Baltic Sea 波罗的海模拟氧动力学和缺氧趋势

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249182

S. Miladinova, A. Stips

{"title":"Trends of simulated oxygen dynamics and hypoxia in the Baltic Sea","authors":"S. Miladinova, A. Stips","doi":"10.1109/BALTIC.2012.6249182","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249182","url":null,"abstract":"Over the last century hypoxia is increasing in large parts of the Baltic Sea. Inflowing salt water brings new supplies of oxygen to the bottom water however is at the same time enhancing stratification and thereby creating favourable conditions for hypoxia. Moreover, it is the increased flux of organic material to the bottom water and sediments due to nutrient enrichment, which has disrupted the balance between oxygen supply through physical processes and oxygen consumption from decomposition of organic material. The aim of the present work is to explore the decadal changes of oxygen availability in the Baltic Sea on the base of a 3D numerical model. The used 3D hydrodynamic model is the General Estuarine Transport Model code (http://getm.eu), which is implemented for the whole Baltic Sea including the Kattegat and is forced with measured water level data at the open boundary. The simulated time period covers the 5 decades from 1960 until the end of 2010. Oxygen concentration in the surface layer is mainly controlled by the air-sea gas exchange depending on wind speed, temperature and salinity. Oxygen consumption in the bulk and oxygen demand at the bottom are both parameterised simple as exponentially increasing functions of temperature and salinity. Despite this simplistic model approach, modelled oxygen concentrations agree well with independent observational data. The statistical analysis of the model data with regard to trends and structural breakpoints in oxygen concentration and anoxic bottom area reveal overall increasing trends. The detailed picture is however more complicated as shown by decreasing trends in the 60ties until the 70ties followed by a trend reversal and accelerated increasing trends after that time. The time series are characterised by a statistical significant breakpoint around the end of the 70ties.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"389 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124799434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Modeling of eutrophication processes in the Gulf of Finland during 1991–2010 1991-2010年芬兰湾富营养化过程模拟

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249186

G. Lessin, A. Stips

{"title":"Modeling of eutrophication processes in the Gulf of Finland during 1991–2010","authors":"G. Lessin, A. Stips","doi":"10.1109/BALTIC.2012.6249186","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249186","url":null,"abstract":"The hydrodynamic model GETM coupled with the ecosystem model ERGOM was applied to the Baltic Sea area for the period 1991-2010. The first part of the modeled period is characterized by considerable socioeconomic changes in the area that are generally considered favorable for the status of coastal marine ecosystems due to a decrease in external nutrient loads. Model results were used to describe and analyze changes in salinity, nutrient (nitrate and phosphate) and oxygen dynamics in the central part of the Gulf of Finland, the most eutrophied sub-basin of the Baltic Sea, over the last two decades. Model validation showed very good agreement between modeled and measured parameters in the Gulf. In the surface layer nitrates were slightly underestimated, while phosphates were overestimated during the second half of the modeled period. Near-bottom parameters were generally accurately reproduced. Model results show that in fact the eutrophication status of the Gulf of Finland has worsened during the last two decades, especially during the latter part of the modeled period. This is reflected in an increased frequency of anoxic events and consecutive high phosphate loading and decrease of near-bottom nitrate concentrations. Stronger stratification favors anoxic conditions in the near-bottom, while a decrease in salinity induced by mixing processes allows for oxygenation of deep areas. However, the effect of these mixing events is short-term and deep water quickly returns to the anoxic state.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114603603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Ground-penetrating radar study of coastal landscape on Hiiumaa Island, Estonia 爱沙尼亚Hiiumaa岛海岸景观探地雷达研究

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249219

K. Vilumaa, A. Kont, U. Ratas, H. Tõnisson

{"title":"Ground-penetrating radar study of coastal landscape on Hiiumaa Island, Estonia","authors":"K. Vilumaa, A. Kont, U. Ratas, H. Tõnisson","doi":"10.1109/BALTIC.2012.6249219","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249219","url":null,"abstract":"This case study presents the results of a ground-penetrating radar (GPR) profiling in Hiiumaa, west Estonian archipelago. Most of the coast of Hiiumaa has emerged from the Baltic Sea during Limnea Sea stage. The study sites are located on Tahkuna Peninsula, northern Hiiumaa where the coastal plain is characterized by a series of beach ridges. The beach ridges are separated by narrow wet depressions where non-calcareous sandy deposits are covered with peat. Due to tectonic land uplift, the landforms are located at different distance from the nowadays shore and at different altitudes. The morphology of landforms and the character of deposits influence the soil formation and the development of peat layer. The layer of varved clays under the sand prevents infiltration and stabilizes the water regime. The water movement also depends on the orientation, height and width of the beach ridges. The achieved results are based on cartographic analysis, fieldwork data including topographic survey and geological radar survey along transects by using SIR-3000. In order to verify the radar image interpretation, 33 boreholes were drilled on the profiles. The main objective of the study was to determine the thickness of peat layer and to characterize the topography of the surface of sub-peat mineral soil by GPR. Two ~1 km long GPR profiles perpendicular to the ridges were examined. A 100 MHz frequency was used, which reflected to approximately 10 m of depth. The study sites in Tahkuna have developed in nutrient-poor environment - the peat layer is thin (up to 1 m) and transitional bog peat makes up a small part of it. The thickness of subjacent sand is 2-4 m. After awhile, the depressions will be filled and the peat layer will cover the beach ridges entirely, which leads to surface leveling, reduction in plant species and simplification of the landscape structure, in general.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128542645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Using MERIS/Envisat data to assess the Secchi depth — A case study from Lithuanian Baltic Sea waters 使用MERIS/Envisat数据评估Secchi深度——以立陶宛波罗的海水域为例

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249175

D. Vaičiūtė

{"title":"Using MERIS/Envisat data to assess the Secchi depth — A case study from Lithuanian Baltic Sea waters","authors":"D. Vaičiūtė","doi":"10.1109/BALTIC.2012.6249175","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249175","url":null,"abstract":"In this study water transparency measured in situ with Secchi disk was compared with maximal remote sensing signal depth Z90_max derived from MERIS/Envisat full resolution (300 m) data in the Lithuanian optically Case 2 coastal waters of the Baltic Sea. Eight MERIS full resolution Level 1b images from late spring and summer of 2010 were processed using three neural network based processors for optically Case 2 or coastal and inland waters - C2R, Eutrophic, Boreal. In the results we found that Eutrophic processor gave the best validation result (R2=80%) when salinity was >; 6.2 PSU, whereas Boreal was better in the plume area, where salinity <;6.2 PSU (R2=40%). The redundancy analysis indicated that salinity and temperature were the most important environmental factors explaining the deviation between estimates by processors and in situ measured Secchi depth. Thus, the plume zone of the freshwater from hypereutrophic lagoon was the most sensitive region for the validation. Consequently, the investigation confirmed Z90_max as a proxy for the Secchi depth and the sufficiency of satellite based remote sensing technique to monitor the changes of water transparency in the Lithuanian coastal waters.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128365065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Changes in coastal ecosystem of the eastern Baltic Sea under eutrophication and climate variability 富营养化和气候变率下波罗的海东部沿海生态系统的变化

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249177

N. Berezina, Y. Gubelit

引用次数: 1

Long term shoreline changes of the Lithuanian Baltic Sea continental coast 立陶宛波罗的海大陆海岸的长期海岸线变化

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249208

I. Bagdanavičiūtė, L. Kelpšaitė, D. Daunys

引用次数: 2

Aesthetic value characterization of landscapes in coastal zones 海岸带景观的美学价值表征

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249166

D. Depellegrin, N. Blažauskas, L. E. Vigl

{"title":"Aesthetic value characterization of landscapes in coastal zones","authors":"D. Depellegrin, N. Blažauskas, L. E. Vigl","doi":"10.1109/BALTIC.2012.6249166","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249166","url":null,"abstract":"Landscapes are essential for society, tourism industries and local communities. The development of tools capable to assess their environmental and socioeconomic importance are fundamental to preserve their aesthetic integrity, especially in coastal areas facing strong anthropogenic pressure. Online photo databases enable users to localize their images via GPS coordinates and share their photo albums with other users, constituting a powerful tool for (1) spatiotemporal investigation of visitor loads in recreational areas, (2) visitor flow definition and (3) aesthetic value characterization of natural and artificial landscape attributes undergone by visitors through shared images in the database. The research presents a framework for aesthetic value characterization in coastal zones using geotags from a webbased photosharing service named Panoramio as data source. A GIS tool for visitor hot spot detection in Lithuanian coastal areas was developed. At selected visitor hot spots, an expert based image content analysis was applied and indicators for the aesthetic value characterization were developed. In total over 63 visitor hot spots were detected along Lithuania's mainland coast and the northern tip of the Curonian Spit. Around 73% of all hot spots cover landscapes in proximity of water bodies. Aesthetic values assessment in hot spots are determined by the variety of anthropogenic and natural landscape attributes in the coastal zone. We conclude that the application of webbased photosharing services and the modeling for aesthetic value characterization can serve for tourism activity planning such as scenic pathways identification, landscape attribute based trip advisory, assessment tool for landscapes changes due to intensive tourism activity and invasive construction projects.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121596590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Bottom relief and water discharge changes in Nemunas delta due to climate change during the last century 上个世纪气候变化导致的Nemunas三角洲底部起伏和水量变化

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249165

Erika Glazaciovaite, Dr. I. Dailidiene, I. Osadcij

{"title":"Bottom relief and water discharge changes in Nemunas delta due to climate change during the last century","authors":"Erika Glazaciovaite, Dr. I. Dailidiene, I. Osadcij","doi":"10.1109/BALTIC.2012.6249165","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249165","url":null,"abstract":"In this paper long term Nemunas River runoff data (measured by the Smalininkai gauge station) and Nemunas delta distributaries water discharges data between the main delta distributaries Skirvyte and Atmata (measured by the Rusne city) are determined by the hydrological observances. Water level and annual runoff relative changes and/or differences between the Smalininkai and Rusne gauge stations are related to the South Eastern Baltic Sea and Curonian Lagoon water level rise and western, south western winds duration and recurrent increase. Diminished and earlier spring floods influence sedimentation processes in the Nemunas delta area. Sediments accumulation is established in the river Rusne. Winds affluent from the Curonian Lagoon cause greater water levels in the Nemunas delta branches and affects the Nemunas River Delta inhabitants - cause inundations, floods. The Nemunas River Delta is very sensitive to climate change. The most sensitive effects are for the main Nemunas river delta distributaries (Skirvyte and Atmata) water distribution and bottom relief changes, sedimentation processes.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"41 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113968572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between coastline changes and dynamics of coastal ecosystems of Tahkuna Peninsula, Estonia 爱沙尼亚塔库纳半岛海岸生态系统动态与海岸线变化的关系

2012 IEEE/OES Baltic International Symposium (BALTIC) Pub Date : 2012-05-08 DOI: 10.1109/BALTIC.2012.6249189

A. Anderson, U. Ratas, R. Rivis, V. Palginõmm

{"title":"Relationship between coastline changes and dynamics of coastal ecosystems of Tahkuna Peninsula, Estonia","authors":"A. Anderson, U. Ratas, R. Rivis, V. Palginõmm","doi":"10.1109/BALTIC.2012.6249189","DOIUrl":"https://doi.org/10.1109/BALTIC.2012.6249189","url":null,"abstract":"The coastal zone as a boundary between sea and mainland is characterized by different landscape types with high biodiversity. Global climate change is one of the most significant factors that is causing changes on coastal area. The climate warming during the last decades has been evident in the Baltic Sea region. The effects of climate change on seacoast can be seen in the changes of sea level, coastal hydrodynamics and ice conditions as well as in human actions. On regional and local level the change of coastal landscape generally depends on shoreline stability. Most vulnerable to erosion are densely populated coastal areas with cities. The coastal erosion is an increasing problem, it also causes reducing and damaging coastal communities including habitats of NATURA 2000. During the last decades, the coastline and morphology of sandy beaches have noticeably changed at Tahkuna Peninsula. Different methods have been used for landscape investigation. Landscape changes were studied by using maps of different periods and analysed with computer programs. Method of landscape complex profile was used as a basis for research. The aim of the study was to find relationships between coastline changes and dynamics of coastal ecosystems. Due to the intensive erosion the study area with habitats of sandy beaches (1210, 1640), embryonic, white, grey dunes (2110, 2120, 2130) has decreased. Repeated surveys in the eastern part of peninsula (Tõrvanina) show the disappearance of a 45-m-wide strip of land during 1976-1998. The eroded deposits are partly transported to the south where the sandy spit is rapidly elongating, there takes place development of new plant communities. Changes along the coast are result of combination of natural processes and human influence (Lehtma harbour). The study area has a high nature conservation and recreational value. Therefore it is essential to continue monitoring and to improve the planning processes in these vulnerable areas.","PeriodicalId":101718,"journal":{"name":"2012 IEEE/OES Baltic International Symposium (BALTIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134147680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4