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Düzce Üniversitesi (2022)

Determination of soil losses in forest road slopes in semi-arid mountainous areas by UAV and terrestrial photogrammetric methods

ÖZÇELİK Vuralhan

Titre : Determination of soil losses in forest road slopes in semi-arid mountainous areas by UAV and terrestrial photogrammetric methods

Yarı kurak dağlık alanlarda orman yolu kazı şevlerinde meydana gelen toprak kayıplarının İHA ve yersel fotogrametrik yöntemlerle belirlenmesi

Auteur : ÖZÇELİK Vuralhan

Université de soutenance : Düzce Üniversitesi

Grade : Master of Science (MS) 2022

Résumé
The construction of forest roads in order to put the mountainous forests into operation brings with it some problems if not careful enough and the necessary protective measures are not taken. Soil erosion comes first among these problems. This issue is especially important in semi-arid ecosystems. The traditional soil loss determination method ; difficulty of parcel establishment, leaks from connection points in the system, overflow of collection tank and monitoring of precipitation time etc. has such disadvantages. With the development of remote sensing technology in recent years, access to soil loss data and obtaining results can be economical, easy and fast. In this thesis, an alternative to the traditional soil loss determination method was investigated by UAV and terrestrial photogrammetric methods. The aim of this study is to determine the soil losses in forest road cut slopes in semi-arid mountainous areas by UAV and terrestrial photogrammetric methods. In addition, the advantages and disadvantages of both methods used in the study were examined. In this context, the 100-meter part of the 3,7 km-long Type B forest road with the code 001, whose construction was completed in August 2019, within the boundaries of the Taşlıyayla Forest Management Chief (Seben/Bolu), was chosen as the study area. Data acquisition was carried out by UAV and terrestrial photogrammetric methods in the period of May 2020 - November 2020.In the results of study ; degradation per unit was determined by UAVerosion in 0.080 m2m-2 area and accumulation in 0.067 m2m-2 area and by terrestrial photogrammetry erosion in 0,127 m2m-2 area and accumulation in 0,088 m2m-2 area. In addition, according to the volumetric degradation per unit area results, -0.0060 m3 m-2 erosion amount and 0.0046 m3 m-2 accumulation amount were determined in the UAV. In the photogrammetric method, -0.0050 m3 m-2 erosion amount and 0.0031 m3 m-2 accumulation amount were found. When both methods were compared temporally, the processes took approximately 2 times longer in the terrestrial photogrammetry method.In addition, while the ground sampling distance of DEM and orthophoto produced with the UAV was 2 cm, it was obtained as 1 cm in the terrestrial photogrammetry method, terrestrial receptions were found to be 2 times higher resolution. According to the results obtained, the terrestrial photogremetric method gives results that are more accurate in such studies.

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Page publiée le 11 janvier 2023