Annals of Valahia University of Targoviste, Geographical Series最新文献

{"title":"A Landsat 8 OLI Satellite Data-Based Assessment of Spatio-Temporal Variations of Lake Sevan Phytoplankton Biomass","authors":"Garegin Tepanosayn, V. Muradyan, Azatuhi Hovsepyan, L. Minasyan, S. Asmaryan","doi":"10.1515/avutgs-2017-0008","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0008","url":null,"abstract":"Abstract The Sevan is one of the world’s largest highland lakes and the largest drinking water reservoir to the South Caucasus. An intensive drop in the level of the lake that occurred over the last decades of the 20th century has brought to eutrophication. The 2000s were marked by an increase in the level of the lake and development of fish farming. To assess possible effect of these processes on water quality, creating a state-ofthe- art water quality monitoring system is required. Traditional approaches to monitoring aquatic systems are often time-consuming, expensive and non-continuous. Thus, remote sensing technologies are crucial in quantitatively monitoring the status of water quality due to the rapidity, cyclicity, large-scale and low-cost. The aim of this work was to evaluate potential applications of the Landsat 8 Operational Land Imager (OLI) to study the spatio-temporal phytoplankton biomass changes. In this study phytoplankton biomasses are used as a water quality indicator, because phytoplankton communities are sensitive to changes in their environment and directly correlated with eutrophication. We used Landsat 8 OLI (30 m spatial resolution, May, Aug, Sep 2016) images converted to the bottom of atmosphere (BOA) reflectance by performing standard preprocessing steps (radiometric and atmospheric correction, sun glint removal etc.). The nonlinear regression model was developed using Landsat 8 (May 2016) coastal blue, blue, green, red, NIR bands, their ratios (blue/red, red/green, red/blue etc.) and in situ measurements (R2=0.7, p<0.05) performed by the Scientific Center of Zoology and Hydroecology of NAS RA in May 2016. Model was applied to the OLI images received for August and September 2016. The data obtained through the model shows that in May the quantity of phytoplankton mostly varies from 0.2 to 0.6g/m3. In August vs. May a sharp increase in the quantity of phytoplankton around 1-5 g/m3 is observable. In September, very high contents of phytoplankton are observed for almost entire surface of the lake. Preliminary collation between data generated with help of the model and in-situ measurements allows to conclude that the RS model for phytoplankton biomass estimation showed reasonable results, but further validation is necessary.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121310178","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}

{"title":"An Investigation Concerning the Impact of Climate Changes on the Water Equilibrium in the Egyptian Nile Delta","authors":"M. Ashour, Tawab E. Aly, Yousra A. Eldegwee","doi":"10.1515/avutgs-2017-0006","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0006","url":null,"abstract":"Abstract In such problematic water situation in Egypt, control and saving of the available limited quantity takes great importance from both technical and national points of view. In addition to all the well-known traditional reasons of the problem such as pollution, over usage, and bad traditions of dealing with water, a new very important reason is added nowadays, called “Climate Changes” which has a direct impact on sea water rising, that causes a serious attack of the salt water to the fresh water especially in River Deltas., Not only the surface water, but also the ground water. Since that process proved some acceleration, several investigations have recently considered the worst impacts of climate change and sea water level rise on sea water intrusion. Most of them have revealed the severity of such problem, and the significance of the land movement of the dispersion zone under the sea water level rise situation. In this paper, we try to introduce a technical review and study for the most popular studies concerning our topic, and its most important conclusions, as an approach for preparing the Ph.D. thesis about the Nile Delta water equilibrium in the light of the expected Mediterranean Sea water level rise. Nile Delta, which located between Damietta Branch on the East, and Rosetta Branch on the west, occupies about 20000 square kilometers of the most rich, productive land in Egypt. About 50% of Egyptian population live in that area, agriculture is the main human activities on them, so water is the prime factor in their life, and their agriculture investments. The great amount of this investment depends on the ground water, which faces a serious challenge due to, two reasons, first, is the overuse, and over pumping, while the second is the attack of the salt water due to the Mediterranean Seawater level rise, because of the climate changes. These two reasons must be overcome, if the first reason can be controlled by law, and technical roles, the second reason needs intensive studies and investigations concerning the interaction between seawater and fresh ground water.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134361704","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}

{"title":"Landform Analysis Using Terrain Attributes. A Gis Application on the Island of Ikaria (Aegean Sea, Greece)","authors":"A. Skentos, Anagnostopoulou Ourania","doi":"10.1515/avutgs-2017-0009","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0009","url":null,"abstract":"Abstract The main objective of this study is to classify the landforms of Ikaria Island by conducting morphometric analysis. The whole classification process is based on the calculation of the Topographic Position Index (TPI). The delivered TPI landform classes are spatially correlated with the geology, slope, valley depth and the topographic ruggedness of the island. The results of this study indicate the presence of two distinctive landform units, affected mainly by the local geological setting.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131618433","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}

{"title":"Gis-Based Determination of Landslide Properties in Regional Scale: Karabuk Province (NW Turkey)","authors":"Berk Duruturk, Nermin Demir, I. Koseoglu, U. Onal, M. Ercanoglu","doi":"10.1515/avutgs-2017-0004","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0004","url":null,"abstract":"Abstract Natural hazards and their consequences are of great importance throughout the world. In Turkey, landslides constitute approximately 5% of the overall damage. The most important part of any landslide study is to extract landslide properties and database. In this study, Karabük city was selected as a study area which is known as one of the most landslide prone areas in Turkey. The study area contains the official borders of Karabük province. The area surrounded by the coordinates of 4518148N-4603891N and 424593E-512511E which has an areal extent of 4067 km square. The data of 1663 occurred landslides in Karabük, were digitized from 1/500.000 scale Turkey Landslide Inventory Map by considering the scarps with point vector format. Considering the literature, parameters of lithology, slope, topographical elevation, NDVI and aspect, which were frequently used among the researchers in landslide assessments, were produced and analyzed a GIS (Geographical Information System) platform. In order to perform analyses, the study area was divided into 62 watersheds. Then, lithology, slope, aspect, topographical elevation and NVDI characteristics of the region were automatically extracted by considering the landslide locations. In this type of study, GIS provides many advantages. For the next stages of landslide assessments such as susceptibility, hazard and risk, this stage provides important inputs and can be considered as the most important stage.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114415960","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}

{"title":"Population Structure in the Ialomiţa Subcarpathians","authors":"Monica Carmen Baltălungă","doi":"10.1515/avutgs-2017-0007","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0007","url":null,"abstract":"Abstract The analyisis of the demographic structures along with that of the main geo-demographic indicators is obligatory in any human geography study regarding a physical-geographic or administrative-territorial unit. The relation between various age groups, the dynamics of the ethnic, linguistic, or confessional structures, the variation of the socio-economic structure offers essential milestones for explaining the social, economic and cultural evolution of a region. Several specific indicators that can be calculated based on these types of structures lay at the basis of the demographic policies and of the identification of the most opportune development programs. This works aims to present a synoptic view of these aspects, of the dynamics of these indicators in the Ialomiţa Subcarpathians after the year 1990, and explain the factors that have influenced these processes and phenomena. This approach is important in the present conditions, when this zone (which holds a very diverse array of natural resources) is faced with a significant demographic and economic decline, which has determined, on the one hand, changes within these structures, and, on the other hand, implicitly, substantial changes on all the levels of the social and economic life.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"5 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132953068","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}

{"title":"Water Supply in the Republic of Serbia – State and Perspectives","authors":"Marko Langović, Vojislav Dedjanski","doi":"10.1515/avutgs-2017-0003","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0003","url":null,"abstract":"Abstract Water supply has pronounced priority, over other forms of water use. The term water supply includes the ensure of high quality water in general terms, for households, public needs and economic activities. The Republic of Serbia disposes with considerable underground and surface water resources, which are used for supplying, but it is required their rational utilization. The aim of this study is to show the current state of water supply on the territory of Serbia based on the analysis of the different indicators. One of the goal is to scan prevalent conditions and problems related to it and to propose optimal solutions. The survey includes an explanation of the long - term needs of the Republic of Serbia for fresh water (as well as share of different sources in the total water supply) and estimation of the possibility of satisfying that needs from available resources. On the base of that, there are adopted conclusions about basic directions of further development in the field of water management and water supply in Serbia.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121082607","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}

{"title":"Estimation of Soil Erosion in Rodnei Mountains National Park Using G.I.S. Technique","authors":"Lazăr Flămînd, Maria-Olivia Moldovan, Izabella Corabian, I. Gliga","doi":"10.1515/avutgs-2017-0010","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0010","url":null,"abstract":"Abstract Erosion is one of the biggest and most widely spread forms of soil degradation, having an impact on both the surrounding environment and the economical one as well. According to a recent study from 2014-2015 by the Common Research Center an estimate of approximately 11.4% of the EU’s territory has been affected by the erosion process in moderate to high levels, the soil’s erosion rate being higher than 5t/ha/year. A significant part of Romania’s surface feels the negative effects of the soils degradation, erosion being the most widely spread long-term complex phenomena. Identifying as exactly as possible the areas with erosion risk is recommended in order to intervene with measures of consolidation, leveling, terrain modeling and other hydro-improving constructions. For this reason, for the studied area, Rodnei Mountains National Park (Maramureș County, Bistrita-Nasaud County), having a surface of 47.177 ha, the soil’s erosion has been modeled via the USLE model, developed by Motoc in 1979, taking into consideration all the climate conditions specific to Romania. Following the implementation of the G.I.S environment model, the soil’s erosion estimate values have been obtained, subsequently being divided in 8 classes of erosion, losses of soil less than 0.5t/ha/year representing 89.3% out of the park’s total surface. Researching the model’s obtained results and comparing them to existing values of soil erosion, locally and nationally, we can draw the conclusion that the results of the USLE model are truthful, and that the model can be successfully used in the studied area. Thereby, the study has targeted the determination of vulnerabilities at the erosional processes and vulnerabilities to erosion, the risk of erosion susceptibility being assessed.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"2018 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121131282","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}

{"title":"Nature and Environment in Collective Perception. Study on the Plain Countryside of the Northern Half Crisana Province, Romania","authors":"Dragoș Dărăbăneanu, I. Dincă","doi":"10.1515/avutgs-2017-0002","DOIUrl":"https://doi.org/10.1515/avutgs-2017-0002","url":null,"abstract":"Abstract The main objective of this study is geared toward how the public understands the nature and the environment, and relates to them. The research universe is represented by the inhabitants of the plain step in the northern half of Crisana Province (north-western Romania). It started from the idea that social representations generate attitudinal and behavioral patterns and the way in which people interact with the environment and nature has a significant influence on quality of life and social development. Therefore, the social representations about the environment and nature have direct effects on our future and can be oriented towards the active participation to the efforts to protect the environment and the nature in general. There were 671 residents of 34 villages questioned and their answers have set a certain socio-geographical pattern on the specifics of life environment belonging to plain. The life environment was perceived by us as a way of reporting to the nature and the environment. The rural respondents from the plain come up with the most common answers, even identical in content, drawing the nature and the environment as ambience, as the space around them.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128839403","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}

{"title":"Geomorphometry of the Glacial Cirques in Zardkuh Mountain, Iran","authors":"A. Ahmadabadi, V. Sargsyan","doi":"10.1515/avutgs-2016-0009","DOIUrl":"https://doi.org/10.1515/avutgs-2016-0009","url":null,"abstract":"Abstract Cirques as one of the glacial erosional forms are suitable indicators to recognize the environmental conditions of the Quaternary period. Therefore, considering the importance of glacial cirque landforms, identifying and mapping the distribution of the circus with their shape features meets the need of environmental science, especially geomorphology. In this paper, in order to identify the quantitative features of cirques in Zardkuh region, the second derivatives, including second-degree curvature of the plan, profile and general curvature along with slope as a primarily derivative were used from geomorphometry indices. To this end, 20 meter resolution digital elevation model was generated from 1: 25,000 topographic map which was used in the geomorphometric analysis. The result shows that secondary derivatives had higher performance in identifying the feature shapes of glacial cirques. Likewise, the plan curvature Index could truly present the headwall around the circus as well as profile curvature clearly showed the avalanche path. In conclusion, it seems that the second derivative indicators, including curvature’s family, have high capability to extract and detect different natural shapes from digital elevation data.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133853016","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}

{"title":"Natural Hazards in the Albanian Area of Lake Ohrid","authors":"Mentor Sulollari","doi":"10.1515/avutgs-2016-0008","DOIUrl":"https://doi.org/10.1515/avutgs-2016-0008","url":null,"abstract":"Abstract The Albanian part of the Lake Ohrid area is endangered by several natural hazards like: floods, landslides, rock falls, erosion and wild fires. Those events have caused environmental, social and economical damages, so it’s important to study the factors that had caused them, their costs and the measures that should be taken to prevent, or to reduce their impact. Most of those events have been triggered by climate change, increasing of human pressure on land and unplanned urban development. Rapid urbanization of latest years has imposed people to build their homes or other activities on unsafe places. Climate change is another factor that has influenced in floods and droughts. The presence of the mountainous relief in the Western part combined with damage of vegetation cover, plays an important role in generating landslides and erosion of land. Natural hazards map of this area, created with GIS, shows where are distributed and which are the zones that can be caught by one of those events. Through this map the habitants of this area and local authorities, will know the risks and take necessary measures to prevent those events. Objectives of this study are to determine the risked areas and measures to minimize damages in life losing, economy and environment.","PeriodicalId":250092,"journal":{"name":"Annals of Valahia University of Targoviste, Geographical Series","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134407581","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}