Soil erosion risk mapping using geographic information systems : a case study on Kocadere creek watershed, İzmir

Download
2005
Okalp, Kıvanç
Soil erosion is a major global environmental problem that is increasing year by year in Turkey. Preventing soil erosion requires political, economic and technical actions; before these actions we must learn properties and behaviors of our soil resources. The aims of this study are to estimate annual soil loss rates of a watershed with integrated models within GIS framework and to map the soil erosion risk for a complex terrain. In this study, annual soil loss rates are estimated using the Universal Soil Loss Equation (USLE) that has been used for five decades all over the world. The main problem in estimating the soil loss rate is determining suitable slope length parameters of USLE for complex terrains in grid based approaches. Different algorithms are evaluated for calculating slope length parameters of the study area namely Kocadere Creek Watershed, which can be considered as a complex terrain. Hickey̕s algorithm gives more reliable topographic factor values than Mitasova̕s and Moore̕s. Satellite image driven cover and management parameter (C) determination is performed by scaling NDVI values to approximate C values by using European Soil Bureau̕s formula. After the estimation of annual soil loss rates, watershed is mapped into three different erosion risk classes (low, moderate, high) by using two different classification approaches: boolean and fuzzy classifications. Fuzzy classifications are based on (I) only topographic factor and, (II) both topographic and C factors of USLE. By comparing three different classified risk maps, it is found that! in the study area topography dominates erosion process on bare soils and areas having sparse vegetation.

Suggestions

Environmental sustainability assessment using dynamic Autoregressive-Distributed Lag simulations-Nexus between greenhouse gas emissions, biomass energy, food and economic growth
Sarkodie, Samuel Asumadu; Strezov, Vladimir; Weldekidan, Haftom; Asamoah, Ernest Frimpong; Owusu, Phebe Asantewaa; Doyi, Israel Nutifafa Yawo (Elsevier BV, 2019-06-10)
Increasing population demand has triggered the enhancement of food production, energy consumption and economic development, however, its impact on climate change has become a global concern. This study applied a novel environmental sustainability assessment tool using dynamic Autoregressive-Distributed Lag (ARDL) simulations for model estimation of the relationships between greenhouse gas (GHG) emissions, energy, biomass, food and economic growth for Australia using data spanning from 1970 to 2017. The stud...
Assessment of management policies for lake Ulubat basin using avswat
Bulut, Elif; Aksoy, Ayşegül; Department of Environmental Engineering (2005)
This thesis assesses phosphorus loads and management practices to control nutrient transport to Lake Uluabat. It analyzes nonpoint sources of pollution, especially agricultural pollution, throughout Uluabat Basin (watershed). AVSWAT (ArcviewTM Interface of Soil and Water Assessment Tool 2000) was used in determination of phosphorus and sediment loads to Lake Uluabat. Contribution of soluble phosphorus (SOLP) loads from agricultural sites was discussed. Seven scenarios were applied through watershed area to ...
Investigating the Changes in Children's Environmental Attitudes Through Mobile Game Intervention
Tok, Aslıhan Mecbure; Niyazi, Aslı; Yeşilada, Yeliz; Sustainable Environment and Energy Systems (2021-9)
Environmental education has gained significant importance in recent years to increase the new generation's environmental awareness, attitudes, and behaviors with the intention of reducing and preventing the possible destruction of climate change. In Northern Cyprus, most of the studies focused on the relationship between environmental education and environmental attitudes of students at secondary school, high school, and university levels. In this thesis, environmental education has been examined from a fre...
Investigation of the spatial relationship of municipal solid waste generation in Turkey with socio-economic, demographic and climatic factors
Keser, Saniye; Aksoy, Ayşegül; Department of Environmental Engineering (2010)
This thesis investigates the significant factors affecting municipal solid waste (MSW) generation in Turkey. For this purpose, both spatial and non-spatial tech¬niques are utilized. Non-spatial technique is ordinary least squares (OLS) regression while spatial techniques employed are simultaneous spatial autoregression (SAR) and geographically weighted regression (GWR). The independent variables include socio-economic, demographic and climatic indicators. The results show that nearer provinces tend to have ...
Investigating the CO2 emission of Turkish electricity sector and its mitigation potential
Arı, İzzet; Tuncel, Süleyman Gürdal; Department of Environmental Engineering (2010)
The rapid industrialization, population growth, urbanization and economic and social development cause many environmental problems, such as climate change which is the result of the increase in the emission of greenhouse gases (GHGs) especially CO2. Combustion of fossil fuels, particularly from electricity generation, has the major responsibility for CO2 emissions. Decreasing the amount of CO2 emission requires a significant shift from our present energy use pattern toward one of lesser reliance on fossil f...
Citation Formats
K. Okalp, “Soil erosion risk mapping using geographic information systems : a case study on Kocadere creek watershed, İzmir,” M.S. - Master of Science, Middle East Technical University, 2005.