In fighting against forest fires, it is crucial for the ground-based firefighting team to reach a fire area in critical response time in which the chance of controlling the fires is significantly high. Road networks are the key infrastructures that provide access to the forest areas for the protection of forest resources. In order to benefit from this important function of roads, especially in forested areas with high natural forest fire risk, they should be built in with adequate technical road standards since the low standards limit the fire truck speed that increases the arrival time of the firefighting team to the fire areas. Most of the forest roads in Turkey are Type-B secondary forest roads with low technical road standards (road width, curve radius, surface materials) that limit the speed of fire trucks. This paper aimed to evaluate the potential contribution of improving the standards of Type-B secondary forest roads in terms of increasing accessible forested areas in critical response time in the case of forest fire occurrence. The study area was Kahramanmaras Forestry Enterprise Directorate (FED), where forests are sensitive to forest fires at the first degree. In the solution process, firstly, accessible forest areas by the firefighting teams (six teams) located in the study area according to the critical response time were determined by considering the existing road network in the study area. In the second scenario, the possible increase in the accessible forest areas with improved forest road standards and increased travel speed in forest roads was investigated. The results indicated that the areas that can be reached promptly by the firefighting teams in critical response time were 21% and 44% for considering existing roads and improved roads in the whole study area. On the other hand, the accessible forested areas in critical response time increased from 17% to 36% when standards of the forest roads were improved. It is indicated that improving road standards has a significant value to contribute the efficiency of firefighting activities if the practitioners implemented presented methodology.
{"title":"Effects of Improving Forest Road Standards on Shortening the Arrival Time of Ground-based Firefighting Teams Accessing to the Forest Fires","authors":"A. Akay, E. Podolskaia, Z. Ucar","doi":"10.33904/ejfe.952174","DOIUrl":"https://doi.org/10.33904/ejfe.952174","url":null,"abstract":"In fighting against forest fires, it is crucial for the ground-based firefighting team to reach a fire area in critical response time in which the chance of controlling the fires is significantly high. Road networks are the key infrastructures that provide access to the forest areas for the protection of forest resources. In order to benefit from this important function of roads, especially in forested areas with high natural forest fire risk, they should be built in with adequate technical road standards since the low standards limit the fire truck speed that increases the arrival time of the firefighting team to the fire areas. Most of the forest roads in Turkey are Type-B secondary forest roads with low technical road standards (road width, curve radius, surface materials) that limit the speed of fire trucks. This paper aimed to evaluate the potential contribution of improving the standards of Type-B secondary forest roads in terms of increasing accessible forested areas in critical response time in the case of forest fire occurrence. The study area was Kahramanmaras Forestry Enterprise Directorate (FED), where forests are sensitive to forest fires at the first degree. In the solution process, firstly, accessible forest areas by the firefighting teams (six teams) located in the study area according to the critical response time were determined by considering the existing road network in the study area. In the second scenario, the possible increase in the accessible forest areas with improved forest road standards and increased travel speed in forest roads was investigated. The results indicated that the areas that can be reached promptly by the firefighting teams in critical response time were 21% and 44% for considering existing roads and improved roads in the whole study area. On the other hand, the accessible forested areas in critical response time increased from 17% to 36% when standards of the forest roads were improved. It is indicated that improving road standards has a significant value to contribute the efficiency of firefighting activities if the practitioners implemented presented methodology.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44820239","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}
In urban universities, there are various noise sources such as roads, railways, construction activities that disturb staffs and students and cause undesirable environment for higher education. In this study, noise reduction effects of trees were investigated in the urban campus of Bursa Technical University (BTU) located in of The campus was surrounded by a major inter-city road with a heavy traffic at the north and there is a large hospital at the south. There is a tree fence along the north boarder and there are groups of trees particularly at the north. In field study, the peak noise level data were collected for 5 minutes in two periods (Morning: 09:00-11:00 and Afternoon: 14:00-16:00) from total of 64 points which were homogenously distributed in the campus. Additional noise data were also collected from outside and inside of tree fence along the north border and from midpoint of each tree group. The coordinates of the noise data points were recorded by a GPS and a noise level layer was generated in ArcGIS 10.4.1. Then, noise map of campus was generated using kriging function based on spatial interpolation of noise data. The results indicated that the average peak noise level was 65.6 dBA in the morning period and 66.1 dBA in the afternon period. The maximum peak noise level of 103.6 dBA was reached in the morning period, while maximum peak noise level was 101.6 dBA in the afternoon period. The average peak noise level within the tree groups were 53.7 dBA (maximum 59.3 dBA) and 54.1 dBA (maximum 61.3 dbA) in two periods, respectively. It was also found that tree fences reduced the noise level by 24.9 dBA and 26.3 dBA in two periods, respectively. The results revealed that trees within urban campus are important to reduce noise effect.
{"title":"NOISE REDUCTION PROVIDED BY TREES IN AN URBAN UNIVERSITY CAMPUS","authors":"I. Tas, Halit Büyüksakalli","doi":"10.33904/ejfe.953100","DOIUrl":"https://doi.org/10.33904/ejfe.953100","url":null,"abstract":"In urban universities, there are various noise sources such as roads, railways, construction activities that disturb staffs and students and cause undesirable environment for higher education. In this study, noise reduction effects of trees were investigated in the urban campus of Bursa Technical University (BTU) located in of The campus was surrounded by a major inter-city road with a heavy traffic at the north and there is a large hospital at the south. There is a tree fence along the north boarder and there are groups of trees particularly at the north. In field study, the peak noise level data were collected for 5 minutes in two periods (Morning: 09:00-11:00 and Afternoon: 14:00-16:00) from total of 64 points which were homogenously distributed in the campus. Additional noise data were also collected from outside and inside of tree fence along the north border and from midpoint of each tree group. The coordinates of the noise data points were recorded by a GPS and a noise level layer was generated in ArcGIS 10.4.1. Then, noise map of campus was generated using kriging function based on spatial interpolation of noise data. The results indicated that the average peak noise level was 65.6 dBA in the morning period and 66.1 dBA in the afternon period. The maximum peak noise level of 103.6 dBA was reached in the morning period, while maximum peak noise level was 101.6 dBA in the afternoon period. The average peak noise level within the tree groups were 53.7 dBA (maximum 59.3 dBA) and 54.1 dBA (maximum 61.3 dbA) in two periods, respectively. It was also found that tree fences reduced the noise level by 24.9 dBA and 26.3 dBA in two periods, respectively. The results revealed that trees within urban campus are important to reduce noise effect.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44414316","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}
Despite an intensive mechanization trend in German forest operations since the early 1990s, many sites restrict the efficient implementation of fully mechanized harvesting systems. Trafficability and singletree selection harvest-based silviculture, focusing on high stem volume broadleaves, such as European beech, are the main limitations. Thus, motor-manual operations are still prevalent but need to be adapted to stay efficient and improve safety in a changing work environment. Recent developments of new felling techniques and aiding tools and advances in training and work organization improved occupational health and safety. Also, these achievements help to avoid log devaluation due to felling damages. The general digitalization trend did not ignore motor-manual operations either. Smartphone applications can already contribute to more efficient bucking, operation planning and fleet management. Yet, motor-manual operations will remain cost-intensive, and expose worker directly to occupational hazards. Therefore, operations should take as much advantage of mechanized systems as possible for feasible and applicable silvicultural objectives.
{"title":"Insights on motor-manual tree felling in Germany, recent developments to ensure efficient operations in singletree selection harvest","authors":"S. Hoffmann, D. Jaeger","doi":"10.33904/ejfe.953226","DOIUrl":"https://doi.org/10.33904/ejfe.953226","url":null,"abstract":"Despite an intensive mechanization trend in German forest operations since the early 1990s, many sites restrict the efficient implementation of fully mechanized harvesting systems. Trafficability and singletree selection harvest-based silviculture, focusing on high stem volume broadleaves, such as European beech, are the main limitations. Thus, motor-manual operations are still prevalent but need to be adapted to stay efficient and improve safety in a changing work environment. Recent developments of new felling techniques and aiding tools and advances in training and work organization improved occupational health and safety. Also, these achievements help to avoid log devaluation due to felling damages. The general digitalization trend did not ignore motor-manual operations either. Smartphone applications can already contribute to more efficient bucking, operation planning and fleet management. Yet, motor-manual operations will remain cost-intensive, and expose worker directly to occupational hazards. Therefore, operations should take as much advantage of mechanized systems as possible for feasible and applicable silvicultural objectives.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42256651","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}
Felling trees, which is the basis of forestry activities, is dangerous and difficult work that needs to be performed carefully. These activities can affect forest workers’ safety, damage the remaining forest, or reduce the value of the extracted product. Most of the accidents and injuries in forestry operations occur due to the trees not falling in the desired direction. Directional mistakes in tree felling processes or underestimating the criteria negatively affect the felling process, which may increase the damage on the product. In terms of life safety and property quality, not only the felling direction but also the safe escape route for the crew should be determined during tree felling. If these issues are ignored due to incomplete information or carelessness, they can cause serious safety problems. However, work safety can be improved through training programs. The primary purpose of this study was to develop a training tool, called “DEViR”, to assist loggers for determination and visualization of the optimal tree felling direction. "DEViR" software was specifically designed to determine the ideal tree felling direction, as well as the escape route for the crew, and dangerous work zone according to safety rule of two tree in a 3D virtual environment. The sample application of the software was run considering artificially placed trees in a study area located in the city of Erzurum in Turkey. The findings of the sample application indicated that the use of this computer-aided simulation systems can provide felling direction solutions with high accuracy and details that cannot be done by a logger’s decision. The results indicated that as the Digital Elevation Model (DEM) and orthomosaic resolution increases, "DEViR" can perform more realistic modeling and accurate calculations, but computation time and hardware requirement increase with increasing data size. Also, it was found that "DEViR" software is a good training tool as it presents visual material, animates the tree felling process interactively, and reflects the result of every decision to the user. Thus, it has great potentials to increase the performance of the loggers in training and daily felling operations.
{"title":"“DEViR”: A Software for Determining and Visualizing Optimal Tree Felling Direction in Three-Dimensional Terrain","authors":"Burak Türkay, A. Aydın","doi":"10.33904/ejfe.932208","DOIUrl":"https://doi.org/10.33904/ejfe.932208","url":null,"abstract":"Felling trees, which is the basis of forestry activities, is dangerous and difficult work that needs to be performed carefully. These activities can affect forest workers’ safety, damage the remaining forest, or reduce the value of the extracted product. Most of the accidents and injuries in forestry operations occur due to the trees not falling in the desired direction. Directional mistakes in tree felling processes or underestimating the criteria negatively affect the felling process, which may increase the damage on the product. In terms of life safety and property quality, not only the felling direction but also the safe escape route for the crew should be determined during tree felling. If these issues are ignored due to incomplete information or carelessness, they can cause serious safety problems. However, work safety can be improved through training programs. The primary purpose of this study was to develop a training tool, called “DEViR”, to assist loggers for determination and visualization of the optimal tree felling direction. \"DEViR\" software was specifically designed to determine the ideal tree felling direction, as well as the escape route for the crew, and dangerous work zone according to safety rule of two tree in a 3D virtual environment. The sample application of the software was run considering artificially placed trees in a study area located in the city of Erzurum in Turkey. The findings of the sample application indicated that the use of this computer-aided simulation systems can provide felling direction solutions with high accuracy and details that cannot be done by a logger’s decision. The results indicated that as the Digital Elevation Model (DEM) and orthomosaic resolution increases, \"DEViR\" can perform more realistic modeling and accurate calculations, but computation time and hardware requirement increase with increasing data size. Also, it was found that \"DEViR\" software is a good training tool as it presents visual material, animates the tree felling process interactively, and reflects the result of every decision to the user. Thus, it has great potentials to increase the performance of the loggers in training and daily felling operations.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41622751","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}
Because of the low investment costs, the winch equipped farm tractors usage is the most common logging technique for the primer transportation of wood-based forest products in Turkey. During the logging operations, farm tractors are commonly used for cable winching at a steep terrain while they are used for skidding operation on relatively flat terrain conditions in forest stands. The aim of this study was to evaluate the working conditions and determine the productivity of uphill winching using a farm tractor during tree length harvesting operation in a Nordmann fir stand (Abies nordmanniana). The study was conducted in Western Black Sea Region of Turkey. The average diameter and length of the forest products which were hauled from stump-site to landing areas were 17 cm and 28 m, respectively. The winching distances were ranged from 10 m to 70 m. Time analysis and field measurements related to independent variables (including winching distance, tree diameter, length and volume) were conducted while the farm tractor was winching the harvested forest products. For the farm tractor, the productivity was estimated and the cycle time prediction model was developed using the multiple regression method. It was found that the average hourly and daily productivity were 5.80 m/hour and 46.42 m/day for 8 hours, respectively. The most time consuming work element was winching (49.2%), followed with delay time (20.1%).
{"title":"Productivity Analysis of Tree-Length Harvesting using Farm Tractor in a Nordmann Fir Stand in Turkey","authors":"S. Çağlar","doi":"10.33904/ejfe.843964","DOIUrl":"https://doi.org/10.33904/ejfe.843964","url":null,"abstract":"Because of the low investment costs, the winch equipped farm tractors usage is the most common logging technique for the primer transportation of wood-based forest products in Turkey. During the logging operations, farm tractors are commonly used for cable winching at a steep terrain while they are used for skidding operation on relatively flat terrain conditions in forest stands. The aim of this study was to evaluate the working conditions and determine the productivity of uphill winching using a farm tractor during tree length harvesting operation in a Nordmann fir stand (Abies nordmanniana). The study was conducted in Western Black Sea Region of Turkey. The average diameter and length of the forest products which were hauled from stump-site to landing areas were 17 cm and 28 m, respectively. The winching distances were ranged from 10 m to 70 m. Time analysis and field measurements related to independent variables (including winching distance, tree diameter, length and volume) were conducted while the farm tractor was winching the harvested forest products. For the farm tractor, the productivity was estimated and the cycle time prediction model was developed using the multiple regression method. It was found that the average hourly and daily productivity were 5.80 m/hour and 46.42 m/day for 8 hours, respectively. The most time consuming work element was winching (49.2%), followed with delay time (20.1%).","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46497929","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}
In forestry applications in Turkey, forest enterprise depots (FEDs) are permanent main places where forest products such as logs and round timbers are stored and presented for sale to the market. The principal functions of FEDs are receiving, classifying, protecting, preparing the forest products for the sales and tracking the stock movements. According to Communique No 288 on the Production of Fundamental Forest Products published by General Directorate of Forestry in Turkey, it is obligatory to conduct stocktaking twice a year in FEDs for tracking and controlling the stock movements. The capabilities of using Unmanned Aerial Vehicles (UAVs) in tracking stock movements in FEDs have not been extensively studied yet in the current literature. This study aimed to test UAVs in determining volume of round timber storages inside a FED named "Gol", located in Golyaka District (Duzce, Turkey). A UAV flight was conducted and volume of round timber storage was calculated from point cloud, and compared to stock records for validation of UAV-based measurements. It was found that UAV-based volume measurements of the stock were quite compatible with available stock records. This study concluded that UAVs could be used in tracking stock movements in FEDs in an effective way.
{"title":"The use of unmanned aerial vehicle (UAV) for tracking stock movements in forest enterprise depots","authors":"R. Eker, A. Aydın","doi":"10.33904/ejfe.835793","DOIUrl":"https://doi.org/10.33904/ejfe.835793","url":null,"abstract":"In forestry applications in Turkey, forest enterprise depots (FEDs) are permanent main places where forest products such as logs and round timbers are stored and presented for sale to the market. The principal functions of FEDs are receiving, classifying, protecting, preparing the forest products for the sales and tracking the stock movements. According to Communique No 288 on the Production of Fundamental Forest Products published by General Directorate of Forestry in Turkey, it is obligatory to conduct stocktaking twice a year in FEDs for tracking and controlling the stock movements. The capabilities of using Unmanned Aerial Vehicles (UAVs) in tracking stock movements in FEDs have not been extensively studied yet in the current literature. This study aimed to test UAVs in determining volume of round timber storages inside a FED named \"Gol\", located in Golyaka District (Duzce, Turkey). A UAV flight was conducted and volume of round timber storage was calculated from point cloud, and compared to stock records for validation of UAV-based measurements. It was found that UAV-based volume measurements of the stock were quite compatible with available stock records. This study concluded that UAVs could be used in tracking stock movements in FEDs in an effective way.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43716755","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}
To use the resources allocated for firefighting in an optimum way, it is important to reach fire sites within the critical response time (CRT) and determine regions with high fire risk. This study aimed to evaluate forests that can be reached within CRT using GIS techniques, regarding fire risk levels. The study area is selected from Yenikoy Forest Enterprise Chief, which is in Bursa Regional Directorate of Forestry and located in second-degree fire-sensitive zone. The accessible forests within CRT were determined using the "Network Analyst" method in ArcGIS 10.4 software. Then, a fire risk map was developed using the AHP (Analytic Hierarchy Process) tool (ExtAHP 2.0) in ArcGIS 10.4. The results showed that the firefighting team near the study area can reach 24.25% of forests within CRT for the second-degree fire-sensitive areas (30 minutes). Besides, it was determined that 46.86% of forests can be reached in 40 minutes and 84.31% in one hour. It was found that 85% of forests were in a very high and high fire risk zones. It was determined that 42% of forests that could not be reached within CRT was in a very high fire risk zones while 43.45% was in a high fire risk zone.
{"title":"Using GIS Techniques for Assessment of Accessible Forest Lands by Firefighting Teams Considering Fire Risk Degrees","authors":"A. Akay, I. Tas","doi":"10.33904/ejfe.843889","DOIUrl":"https://doi.org/10.33904/ejfe.843889","url":null,"abstract":"To use the resources allocated for firefighting in an optimum way, it is important to reach fire sites within the critical response time (CRT) and determine regions with high fire risk. This study aimed to evaluate forests that can be reached within CRT using GIS techniques, regarding fire risk levels. The study area is selected from Yenikoy Forest Enterprise Chief, which is in Bursa Regional Directorate of Forestry and located in second-degree fire-sensitive zone. The accessible forests within CRT were determined using the \"Network Analyst\" method in ArcGIS 10.4 software. Then, a fire risk map was developed using the AHP (Analytic Hierarchy Process) tool (ExtAHP 2.0) in ArcGIS 10.4. The results showed that the firefighting team near the study area can reach 24.25% of forests within CRT for the second-degree fire-sensitive areas (30 minutes). Besides, it was determined that 46.86% of forests can be reached in 40 minutes and 84.31% in one hour. It was found that 85% of forests were in a very high and high fire risk zones. It was determined that 42% of forests that could not be reached within CRT was in a very high fire risk zones while 43.45% was in a high fire risk zone.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41601404","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}
The growing concerns on forest ecosystem services and sustainable management of the resources with workforce, material, and products require effective planning of forestry operations in a hierarchical level. Operational planning as a component of the hierarchy generates short-term harvest planning decisions to minimize total costs by making production and distribution decisions during all seasons. Operational harvest planning of wood harvesting has been not used in Turkish conditions. Many developments and changes in managerial and operational processes in Turkish state forestry require the right product in the right place at the right time. This indicates that it is time to use operational planning to solve the wood harvesting problem with respect to specific conditions of Turkish forestry. This study introduces a model for annual planning of harvest operations/operational harvest planning (OHARP) from stand to storage for a one-year time horizon. The article presents how the operational decisions can be optimized for selection of the most appropriate harvesting blocks, time, system, landing location, and transportation mode to provide the best balance between time and cost. The mathematical model of the planning problem was formulated with linear and mixed integer programming techniques. The data for the model comes from the forest planning units and operation systems which is combined to minimize total supply costs subject to technical, environmental and socio-economic constraints. The model was tested with the real harvesting data from a forest district in the Mediterranean Region for a one year planning horizon. The test results demonstrated that when the OHARP model was implemented in the test area and compared with the actual cost of the harvest operations realized in this area, a savings of at least 4% could be achieved by better matching appropriate harvesting systems and methods to the terrain using the OHARP methodology. When operational decisions including resource constraints were optimized, up to a 30% cost reduction could be achieved in terms of average harvesting and transportation cost.
{"title":"Refocusing on Operational Harvest Planning Model for State-Owned Forestry in Turkey","authors":"M. Eker, J. Sessions","doi":"10.33904/ejfe.829946","DOIUrl":"https://doi.org/10.33904/ejfe.829946","url":null,"abstract":"The growing concerns on forest ecosystem services and sustainable management of the resources with workforce, material, and products require effective planning of forestry operations in a hierarchical level. Operational planning as a component of the hierarchy generates short-term harvest planning decisions to minimize total costs by making production and distribution decisions during all seasons. Operational harvest planning of wood harvesting has been not used in Turkish conditions. Many developments and changes in managerial and operational processes in Turkish state forestry require the right product in the right place at the right time. This indicates that it is time to use operational planning to solve the wood harvesting problem with respect to specific conditions of Turkish forestry. This study introduces a model for annual planning of harvest operations/operational harvest planning (OHARP) from stand to storage for a one-year time horizon. The article presents how the operational decisions can be optimized for selection of the most appropriate harvesting blocks, time, system, landing location, and transportation mode to provide the best balance between time and cost. The mathematical model of the planning problem was formulated with linear and mixed integer programming techniques. The data for the model comes from the forest planning units and operation systems which is combined to minimize total supply costs subject to technical, environmental and socio-economic constraints. The model was tested with the real harvesting data from a forest district in the Mediterranean Region for a one year planning horizon. The test results demonstrated that when the OHARP model was implemented in the test area and compared with the actual cost of the harvest operations realized in this area, a savings of at least 4% could be achieved by better matching appropriate harvesting systems and methods to the terrain using the OHARP methodology. When operational decisions including resource constraints were optimized, up to a 30% cost reduction could be achieved in terms of average harvesting and transportation cost.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41926969","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}
The forest roads provide access to forest resources in carrying out main forestry activities such as protection, afforestation, management, recreation and firefighting. Long-term, trouble-free and safe use of forest roads is possible through the construction of the drainage structures and walls along the road alignment. The drainage structures and protective structures used in forest roads are various types. These are dip drains, pipes, culverts, bridges, water-bars and walls. The main task of all drainage structures and walls is protecting the forest roads against external aggressors. In this study, drainage structures on a sample road were investigated. Along the forest road alignment, changes of drainage structures over 10 years were observed. As a result of the study, current conditions of drainage structures were revealed and various suggestions were presented.
{"title":"Temporal Change of Drainage Structures in Forest Roads (Study of Bentler Forest Enterprise 2009-2019)","authors":"Tolga Öztürk","doi":"10.33904/ejfe.721965","DOIUrl":"https://doi.org/10.33904/ejfe.721965","url":null,"abstract":"The forest roads provide access to forest resources in carrying out main forestry activities such as protection, afforestation, management, recreation and firefighting. Long-term, trouble-free and safe use of forest roads is possible through the construction of the drainage structures and walls along the road alignment. The drainage structures and protective structures used in forest roads are various types. These are dip drains, pipes, culverts, bridges, water-bars and walls. The main task of all drainage structures and walls is protecting the forest roads against external aggressors. In this study, drainage structures on a sample road were investigated. Along the forest road alignment, changes of drainage structures over 10 years were observed. As a result of the study, current conditions of drainage structures were revealed and various suggestions were presented.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47657205","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}
The increasing level of competition in the global forestry market demands that stakeholders continuously measure their performance with the aim of remaining competitive and profitable in the ever-changing wood market. This study applies categorical data envelopment analysis (DEA) methodology to the New Zealand forest harvesting sector. This methodology is able to account for ordinal non-discretionary variables in the DEA. The influence of log extraction method and processing location on the estimated efficiency scores were examined. To define the forest harvesting DEA production technology, three inputs (harvest area, average piece size, level of mechanization), one output (tons/scheduled hour) and one categorical non-discretionary variable with three levels were used. The categorical variables were defined by the level of difficulty as reported by harvest supervisors for specific forest harvesting operating environment. The study demonstrated the appropriateness of the categorical DEA approach in measuring performance in forest harvesting operations. It showed significant influence of timber extraction methods on the overall performance estimate, whereby grapple skidders at 58% had the highest mean efficiency score. While log processing locations showed no significant influence on the estimated performance, processing at the stump had the highest mean efficiency score.
{"title":"Estimating the Influence of Extraction Method and Processing Location on Forest Harvesting Efficiency - A Categorical DEA Approach","authors":"O. Obi, R. Visser","doi":"10.33904/ejfe.722822","DOIUrl":"https://doi.org/10.33904/ejfe.722822","url":null,"abstract":"The increasing level of competition in the global forestry market demands that stakeholders continuously measure their performance with the aim of remaining competitive and profitable in the ever-changing wood market. This study applies categorical data envelopment analysis (DEA) methodology to the New Zealand forest harvesting sector. This methodology is able to account for ordinal non-discretionary variables in the DEA. The influence of log extraction method and processing location on the estimated efficiency scores were examined. To define the forest harvesting DEA production technology, three inputs (harvest area, average piece size, level of mechanization), one output (tons/scheduled hour) and one categorical non-discretionary variable with three levels were used. The categorical variables were defined by the level of difficulty as reported by harvest supervisors for specific forest harvesting operating environment. The study demonstrated the appropriateness of the categorical DEA approach in measuring performance in forest harvesting operations. It showed significant influence of timber extraction methods on the overall performance estimate, whereby grapple skidders at 58% had the highest mean efficiency score. While log processing locations showed no significant influence on the estimated performance, processing at the stump had the highest mean efficiency score.","PeriodicalId":36173,"journal":{"name":"European Journal of Forest Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48888189","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}
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