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DocumentExamining the applicability of UAV-based photogrammetry to assess sediment yield from small fire-affected forests
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Forest clearance after a fire is commonly implemented in fire-affected forests in South Korea, removing damaged vegetation and ash-litter layers. It undoubtedly affects hydrological processes, thereby leads to severe soil erosion to the downstream waterbodies such as stream, reservoir, dam. Therefore, accurate understanding of the magnitude of sediment yields is a prerequisite to implement the sediment control measures in the fire-affected region. Over the past decades, direct field measurement of sediment yields has been conducted over the world, particularly in South Korea. The traditional field survey has restricted to the application due to requiring a lot of labor and time and is only used to small and limited area. In this study, we tried to overcome the limitations of traditional approach by monitoring the sediment yield variations through images obtained from UAVs. For this purpose, direct field survey and UAV image-based photogrammetry were conducted on erosion control dams located in the downstream of mountain terrain. A comparison of sediment deposition in the dams were done to assess the applicability and reliability of UAV photogrammetry in forest sectors. The results show that UAV-derived photogrammetry technique can be considered as the alternative of field surveying when estimates the relief and terrain shape in a site where direct access and available resource are limited. This study may introduce a simple and accurate methodology for measuring soil loss and sediment yield on degraded mountain areas. Keywords: Monitoring and data collection ID: 3623072 -
DocumentA study on tree species and crops of agroforestry according to ecological geographic map in North Korea
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.This study was conducted to analyze the appropriate tree species and crops according to agroforestry target sites in North Korea based on ecological geography and site properties with the purpose of preparation of technical cooperation on agroforestry, one of the main agendas of the Inter-Korean Forest Cooperation Subcommittee. The agroforestry is one of the methods for forest restoration that satisfies both North Korea's fuel and food shortages and the restoration of deforested land and it began in 2003. To this end, the ecological geographic map (13 regions and 4 zones) of North Korea was made by using satellite images with North Korean journals. The target sites for agroforestry was classified according to 18 site conditions depending on 3 site characteristics (soil depth, relative location, slope), and divided as short-term and long-term target sites depend on agroforestry management period. And then, appropriate tree species and crops for agroforestry are selected according to them. By regions within the same zone, tree species and crops were mostly similar, but compared to each zone, they differed. This seems to be because the geographical climatic characteristics reflected in the ecological geographic map vary greatly from zone to zone. Through this, it is expected to provide information that can be more efficiently implemented through analysis of the target sites needed for application of agroforestry and needed for application of agroforestry management and the combination of suitable species and crops. Keywords: Deforestation and forest degradation, Research, Policies ID: 3623065 -
ProjectRehabilitation of the Bolaman and Çekerek Basins - UTF/TUR/067/TUR and UTF/TUR/068/TUR 2022
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No results found.Soil erosion, land degradation and desertification are among the most severe environmental problems in Türkiye. Water quality and scarcity are also of grave concern as they affect the availability of water resources for human consumption and economic uses. Deforestation, sedimentation, discharges of untreated industrial and domestic effluents into freshwater bodies and the sea, insufficiency of wastewater treatment facilities, and diffuse nitrogen and ammonia pollution from agricultural activities, all contribute to decreased water quality. In addition to natural resource degradation problems, Türkiye is vulnerable to a range of natural disasters, with floods and landslides the second and third most frequent and disastrous hazards after earthquakes. The Bolaman Basin, located in the Eastern Black Sea region, experiences a composite of problems typical of the region, including soil erosion, the degradation of forest ecosystems, surface water pollution, landslides, drought and floods, all of which affect the well being and livelihoods of the local population. Similar challenges are faced by the Çekerek Basin. With a view to developing integrated solutions to these challenges, OGM initiated the preparation of two projects: the Bolaman River Basin Rehabilitation Project and the Çekerek Basin Rehabilitation Project (hereinafter referred to, respectively, as the Bolaman Project and the Çekerek Project), with funding in the form of a loan allocation from the World Bank (WB ). FAO assistance was requested to develop preparatory documents for the two rehabilitation projects.
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