Murat Demir | Istanbul University-Cerrahpaşa (original) (raw)

Papers by Murat Demir

Forest road is a complex and cost stage of the transportation. Forest roads enables to transporta... more Forest road is a complex and cost stage of the transportation. Forest roads enables to transportation of forest products. Well planned forest road networks improve effectiveness of transport. In order to provide safe and continuous transport long timber, long vehicles such as long truck, 18 wheels needed and appropriate curve widening. In the study, CAD based horizontal driving analysis were performed on existing forest road to determine curve widening requirements for truck and semitrailer. According to results, in case of using semitrailer with 4-meter platform width curve widening area will be needed 6 times more than using truck while, platform with 5-meter curve widening area will be needed 16 times more than truck usage. Consequently, driving analysis results is a beneficial approach for decision makers to achieve optimal solution and to minimizing transport operation costs in forestry.

Journal of the Faculty of Forestry Istanbul University, 2002

Bolu mintikasinda orman yol sebeke ve nakliyat planlarinin bilgisayar ortaminda duzenlenmesi

This study is investigating differences of timber transportation methods and harvesting mechaniza... more This study is investigating differences of timber transportation methods and harvesting mechanization level progress of Turkey. Furthermore, major problems of timber harvesting in Turkey and the future principles and objectives have been defined. Timber harvesting in Turkey is still carried out by manual methods due to economical, social and environmental constraints. Almost 80% of harvesting activities are mechanized in many developed countries while this value is only 5% in Turkey. Overall ratio of mechanization is relatively low. Approximately percentage of man power, animal power, machine power and skyline harvesting are 72%, 15%, 8% and 5%, respectively. Turkish General Directorate of Forestry's timber harvesting machines total amount is 448 in 1982, 859 in 1998, 457 in 2005 and 376 in 2009. Timber harvesting machines amount has been reduced to 20 tractors (4x4 and assembled shovel), 133 skidding winches, 5 tractors with equipment of snow cleaner, 38 forklifts, 18 loaders, ...

Journal of the Faculty of Forestry Istanbul University, 2000

Turkiye'de orman yollarini karayollarindan ayiran ozellikler ve bu yollarin siniflandirilmasi

Journal of environmental biology, 2007

In this study the impact of production work on the skid roads that have been carried out for many... more In this study the impact of production work on the skid roads that have been carried out for many years by manpower animal power or machinery in a beech (Fagus orientalis Lipsky) stand have been examined. For this purpose, herbaceous understory, forest floor and soil samples were collected from the undisturbed area and the skid road. Weight per unit area (kg ha(-1)), organic matter ratio and moisture of forest floor and herbaceous understory were measured in undisturbed area and the skid road. Soil characteristics were examined at two different depths (0-5 cm and 5-10 cm). Percentages of sand, silt and clay electrical conductivity, weight of fine soil (<2 mm), soil fraction (>2 mm), root mass, organic carbon, moisture equivalent, total porosity, bulk density, moisture, compaction and pH values in the soil were determined. It has been determined that the amount of herbaceous understory and forest floor on the skid road decreased considerably compared to those of the undisturbed...

African Journal of Biotechnology, 2009

This paper describes the situaiton and assessment of forest roads and firebreaks in context of fo... more This paper describes the situaiton and assessment of forest roads and firebreaks in context of forest transportation and forest fire prevention in Turkey. In recent years, Turkey has lost many forest areas to forest fires, and this not only results in loss of life, property, and infrastructure, but also causes deterioration in the natural environment and degrades ecosystems. According to current status of Turkey, the numbers of forest fires and the areas that are burnt fluctate widely from year to year. In the last decade, the number of forest fires has increased, but the area burned per forest fire has decreased. The Turkish General Directorate of Forestry spent 82.92milliontofightforestfiresin2003and82.92 million to fight forest fires in 2003 and 82.92milliontofightforestfiresin2003and677.71 million over the last decade. As of the end of 2006, the total number of forest fires in Turkey since 1937 is 80 011, giving an average of 1143 fires per year. For the same period, the total forest area burned is 1 571 607 ha and the mean forest area burned per fire i...

Turkey has 57% mountainous terrain a rugged topography with high area covering a large section of... more Turkey has 57% mountainous terrain a rugged topography with high area covering a large section of forest in mountainous terrain. Activities being undertaken in the forestry sector include; transportation, silviculture, forestation, fire fighting, insect and disease control, growth monitoring, monitoring of forest health and other activities that are required for transport through the forest roads. However, as the importance of the environmental impacts of forest roads increases, the forest habitat of roads, landslide and erosion, and adverse effects on river hydrology are research priorities. In this context, the reason of forest roads construction, protective vegetation and organic layers were removed from large areas of surface erosion, to become open to the large amounts of soil and rock were dug to be exposed to mass movement and often corrupt bias of the remaining balance is made. As a result, sediment transport in streams after road construction, road construction compared to ...

Environmental Monitoring and Assessment

Well-maintained pavements reduce occurring severe accidents on horizontal curves. For this reason... more Well-maintained pavements reduce occurring severe accidents on horizontal curves. For this reason, the monitoring and evaluation of pavement conditions are important. This study evaluates pavement conditions considering volumetric degradation or displacement on 11 horizontal curves in forest roads, depending on meteorological conditions, traffic effects, and curve parameters. Within this context, pavement displacement (degradation) was investigated and measured with terrestrial laser scanning (TLS) for a year on a monthly basis. In this study, two multiple regression models were developed to estimate the degradation values of a forest road. According to model 1, which was developed to estimate the loss volume values, the adjusted R2 was 0.658. For model 2, which was developed to estimate the gain volume values, the adjusted R2 was 0.490. Validations of models were evaluated with different statistical tests. In conclusion, volumetric degradation can be calculated with TLS-based data. Forest road designers should determine horizontal curve characteristics, taking into consideration the pavement degradation and traffic safety.

Measurement, 2017

Abstract Degradation on the forest roads have an important factor for the traffic safety and the ... more Abstract Degradation on the forest roads have an important factor for the traffic safety and the safe drive of the vehicles. The aim of the study is to determine accurately the degradation rate of the pavement with high precisions, exposed to deformation by meteorological conditions in the short term, on the forest roads using with ZF 5010C Terrestrial Laser Scanner (TLS). Road surface model results which are obtained from areal comparison digital surface model show that maximum swelling and collapsing values occurred on depth of (0.00)–(0.01) and (0.00)–(−0.01) during between November 2015 and April 2016. According to result of volumetric analysis of digital surface models, maximum net gain volume was calculated as 32.50 m 3 (73.70%) in January–December, while net loss was calculated maximum −30.24 m 3 (61.67%) in December–November. Volumetric degradation results are compared with meteorological factors. According to comparison it was observed that degradation and sediment production from forest roads surface is related to total rainfall. Our results revealed that Terrestrial laser scanner can be used effectively in measurement of degradation. Additionally, 1 cm resolution is sufficient in terms of accuracy of evaluation. Also, registration and geo-referencing is one of the most important factors for accuracy of surface model.

İstanbul Üniversitesi Orman Fakültesi Dergisi, 2004

... Orman iiriinlerinin Liretimi ve tasinmasi sirasinda her saﬂwada devamli bir kontroltln saglan... more ... Orman iiriinlerinin Liretimi ve tasinmasi sirasinda her saﬂwada devamli bir kontroltln saglanmasina QZ11|$l1m111(111'. KAYNAKLAR /\Yl\'lJ'1'_ '1". 1972: Bolu Mintikasinda Orman Nakliyatinin Nakliyat Teknigi Bakimmdan /\f£1$11I'l1ml1S1. ... Ankara. DIZMIR. ...

African Journal of Biotechnology, 2010

This study was aimed at investigating different timber transportation methods and harvesting mech... more This study was aimed at investigating different timber transportation methods and harvesting mechanization progress level of Turkey. Furthermore, major problems of timber harvesting in Turkey and the future principles and objectives were defined. Timber harvesting in Turkey ...

In this study, long-term timber skidding effects on herbaceous understory forest floor and soil w... more In this study, long-term timber skidding effects on herbaceous understory forest floor and soil were investigated on a skid road in a stand of the eastern beech (Fagus orientalis Lipsky). For this purpose, herbaceous understory forest floor and soil samples were collected from the skid road and from an undisturbed area used as a control plot. The mass (kg ha(-1)) of herbaceous and forest floor samples was determined, and soil characteristics were examined at two depths (0-5 cm and 5-10 cm). We quantified sand, silt and clay content, as well as bulk density compaction, pH, and organic carbon content in soil samples. The quantities of N, K, P, Na, Ca, Mg, Fe, Mn, Zn and Cu were determined in all herbaceous cover forest floor and soil samples. The quantities of Na, Fe, Zn, Cu and Mn in herbaceous understory samples from the skid road were considerably higher than those in the undisturbed area, while the quantity of Mg was considerably lower. These differences could have been caused by ...

Forest Ecology and Management

Environmental monitoring and assessment, Jan 31, 2018

Forest road design and construction are time-consuming and complicated because various risk facto... more Forest road design and construction are time-consuming and complicated because various risk factors can be encountered during the process. The aim of this study is to comprehensively assess the risk factors in forest road design and construction using the fuzzy analytic hierarchy process (AHP) method in Turkey, thus contributing to the proper performance of these activities. Within the scope of the study, six main risk factors and 22 sub-risk factors were identified based on literature review. In order to determine the weights of the relevant risk factors, the opinions of three different groups [(group 1: academicians), (group 2: forest engineers (private sector employees + public sector employees)), (group 3: group 1 + group 2)] about the risk factors were obtained. Relevant risk factor weights were determined using the fuzzy AHP method. According to group 3, the most important main risk factors are technical risks and environmental risks. In addition, the most important sub-risk f...

Journal of the Faculty of Forestry Istanbul University, 1996

The Baltic Journal of Road and Bridge Engineering, 2016

Forest road planning is a time-consuming and complicated process both because it requires environ... more Forest road planning is a time-consuming and complicated process both because it requires environmentfriendly road building, and due to the requirement to observe economic costs. This costs will be increase depending on maneuverability requirements of vehicle dimension. The main aim of this study is to analyze maneuverability of recreational vehicles on forest roads that primarily serve utilization of vehicles intended for production as well as geometrical characteristics of roads on computer environment. Both dynamic horizontal driving analysis and dynamic vertical driving analysis can be made with Autopath driving analysis module of Plateia 2013 software. Computer-aided horizontal driving analysis, which is used in examination of opportunities for utilization of available roads by different vehicle types, appears as an effective method for the decision maker in consideration of geometrical standards of vehicles during decision-making process. Graphical report is another output of ...

İstanbul Üniversitesi Orman Fakültesi Dergisi, 2015

This study was carried out to examine the applicability of forest roads as emergency access and e... more This study was carried out to examine the applicability of forest roads as emergency access and evacuation corridor for an alternative to motorways following a prospective earthquake in İstanbul. For this purpose, various disaster scenarios were created in the district of Beykoz and the shortest routes between critical points were determined through network analysis in Geographic Information System (GIS). Results indicated that access was possible between Beykoz city center and shelter, hospital, fire station, disaster management center, and military area via forest roads even if motorways became unusable. However, distance generally got longer and time of arrival increased on the routes of forest road. The increase in time of arrival was attributed to decrease in average cruising speed in addition to the increase in distance. This limitation can be overcome by enhancing the geometric standards of forest roads and completing superstructure operations. Results are important for revealing that forest roads can be used in other fields besides forestry activities, they can strengthen decision support system of managers, and enable first aid crew to reach the scene in the minimal time.

İstanbul Üniversitesi Orman Fakültesi Dergisi, 1997

... i. U Orman Fakilllesi Yaym N0. 1747/I85, I'.\'lun]Ju/. Page 5. 56 MURAT DEM... more ... i. U Orman Fakilllesi Yaym N0. 1747/I85, I'.\'lun]Ju/. Page 5. 56 MURAT DEMIR BA YOGLU.S..' SEQWKIN, OB. ... 1994, I-slanbul. HASDEMTR, DEM1R, M. 1998; Orman Yollarmm Plunlamnuxmda Kullam/abilecek Bilgzl sayar Programlan, Cumhuriyerimizin 75. ...

Transportation Research Part D: …, 2010

This study examines annual ring widths, diameter growth and increment differences of trees at a s... more This study examines annual ring widths, diameter growth and increment differences of trees at a skid road and the undisturbed area in a pure plantation fir (Abies bornmulleriana Mattf.) forest and compare these data with annual ring widths diameter growth and increment of trees ...