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Displaying 231 - 235 of 1195Regional land-use allocation with a spatially explicit genetic algorithm
Land-use allocation is an important way to promote the intensive and economic use of land resources and achieve the goal of sustainable development. It is a complex spatial optimization problem, and heuristic algorithms have been one of the most effective ways to solve it in past studies. However, heuristic algorithms lack the guidance of planning knowledge, which makes land-use patterns usually unreasonable in practice. This research proposes a spatially explicit genetic algorithm (SEGA) that integrates land-use planning knowledge with the genetic algorithm (GA).
Drivers of Coastal Shoreline Change: Case Study of Hon Dat Coast, Kien Giang, Vietnam
Coastal shorelines are naturally dynamic, shifting in response to coastal geomorphological processes. Globally, land use change associated with coastal urban development and growing human population pressures is accelerating coastal shoreline change. In southern Vietnam, coastal erosion currently is posing considerable risks to shoreline land use and coastal inhabitants.
carbon balance of Norway: terrestrial and aquatic carbon fluxes
Northern landscapes accumulate carbon in vegetation and soils while rivers transport significant amounts of land-derived carbon to coastal areas. Here, we quantify carbon sources and sinks in main ecosystems (forests, peatlands, mountains, agricultural areas, lakes) in Norway for 1990–2008, and compare riverine carbon transport with terrestrial carbon accumulation in Norway’s four major discharge areas. Mean annual carbon accumulation (6.0 ± 0.9 Tg C; 19 g C m⁻²) in terrestrial ecosystems balanced 40 % of national greenhouse gas emissions.
Metal content in the waters of the upper Sanna River catchment (SE Poland): condition associated with drilling of a shale gas exploration wellbore
Detailed research on the content of heavy metals in ground and surface waters in the upper Sanna River catchment was initiated in 2013. The investigations were conducted in one of the most promising areas of potential shale gas extraction, in which the Frampol 1 test wellbore was drilled in 2012 (SE Poland, Roztocze Region). In the area of the wellbore, hydrochemical analyses of the waters of the river drainage zone were performed. Water was sampled from six objects representing soil water, porous groundwater, fissure-layer groundwater, and river water.
Soil erosion assessment using USLE in the GIS environment: a case study in the Danjiangkou Reservoir Region, China
The purpose of this study was to investigate the spatial distribution of annual soil loss in the Danjiangkou Reservoir Region, China. Soil erosion was estimated by integrating the universal soil loss equation (USLE) model with GIS. The main factors affecting soil erosion including rainfall erosivity, soil erodibility, slope length and steepness, cover and management factor, and conservation supporting practice factor were determined from precipitation data, soil sample analysis, digital elevation model, land use and land cover, and empirical assessment, respectively.