Muharrem Hilmi Erkoç

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Muharrem Hilmi verified their affiliation via an institutional email.

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• Doctor of Philosophy
• Professor (Associate) at Yıldız Technical University

This study investigates the relationship between GPS observing session duration and sensitivity, measured using non-centrality parameters. TUSAGA-AKTIF (Türkiye's CORS-TR) network with 15 stations was used for this aim. Data with 4h, 6h, 12h, and 24h observing session durations from three sequential days in 2011, 2012, and 2013 were analyzed using...

This study presents a comprehensive investigation of the complex dynamics of sea-level rise (SLR) and its multiple impacts on coastal regions in southern Africa. We meticulously analyse trends and patterns in SLR and subsidence rates using a wealth of data from 1993 to 2022, including observations from a network of 10 reliable tide gauges and XTRAC...

This study presents a comprehensive investigation of the complex dynamics of sea-level rise (SLR) and its multiple impacts on coastal regions in southern Africa. We meticulously analyse trends and patterns in SLR and subsidence rates using a wealth of data from 1993 to 2022, including observations from a network of 10 reliable tide gauges and XTRAC...

The aim of this study is to determine the vertical land motion (VLM) and horizontal land motion (HLM) at the tide gauge stations located along the coast of the Black Sea using ground-based (GNSS and tide gauge) and satellite-based (satellite altimetry and InSAR) data. In this context, the tide gauge data were initially obtained from the Turkish Sea...

The presented study aims to monitor a potential hydrological drought in Lake İznik, one of the largest freshwater lakes in Türkiye, located in the NW region of the country. In this context, in-situ and satellite altimetry-based water level data, meteorological data such as temperature and precipitation, and high-resolution multispectral satellite i...

Estimation of sea level trends is essential for understanding sea level rise dynamics. In this study, the performance of traditional Ordinary Least Squares (OLS) linear trend forecasting is compared with modern machine learning techniques, specifically Random Forests (RF) and Least Squares Support Vector Machines (LS-SVM).These methods are applied...

Several factors, including water level, depth, water quality, biodiversity, and tourist activities, play a crucial role in the sustainability of lakes, and therefore require constant monitoring. This study aimed to examine the water level changes of Lake Beysehir between 2015 and 2020 and determine whether there was a difference in bathymetry as th...

The rise in sea level along the coasts of New Zealand has accelerated in recent decades due to the impact of climate change. Determining the effects of these changes on the coastal regions is critical for their sustainability. In order to gain insight into these impacts, the present study aimed to analyze sea level changes using satellite altimetry...

Lake Beyşehir is a crucial water resource for its region; however, its water level has visibly decreased over the past decade, thus posing a threat to the lake's sustainability. This study aims to investigate the causes behind this phenomenon and its impact on the lake surface area. To achieve this, the study uses monthly lake water level data from...

Analyzing the data accurately is crucial for tracking sea level changes and predicting future changes. This study mainly focused on the trend analysis for identified the changes in sea level using Mann-Kendall trend analysis method. The study area was selected the Black Sea coasts of Türkiye, which were thought to reflect the region's dynamics due...

This study aims to determine the datum definition for the geodetic vertical velocity field derived from temporary and continuous GNSS observations. The observations have been analysed to investigate how the effect of vertical velocity for GNSS stations depends on the reference station selection. For this purpose, a network consisting of 26 GNSS sta...

Most people live in coastal areas. Hence, coasts are important regions for sustaining habitats and living beings. Sea level is one of the most important causes that affect the sustainability of life in coastal areas. Therefore, the sea level should constantly be monitored to examine whether there is an increase due to global warming. In this sense,...

Lake water levels change due to many reasons such as climate change, tectonism, erosions, and use in field irrigation. Especially, monitoring of climate change indicators and lake water levels due to the effect of global warming is important for the sustainability of lakes. With climate change and the decrease in water, the lake area is also shrink...

This study aims to estimate Vertical Land Motion (VLM) using multi-sensor and in-situ data at the tide gauge stations (TG) located on the western and southern coasts of Turkey. The analysis of tide gauge data, used to determine sea level changes for centuries, was supported by modern global geodetic observations, and the effect of VLM on the sea le...

January 24, 2020 Sivrice earthquake (Mw 6.8), which is the largest along the East Anatolian Fault (EAF) over the last century, is providing a wealth of information on the mechanics of transform faulting and for monitoring the different phases of the last seismic cycle. In this study, we aim to estimate coseismic and postseismic surface deformation...

The aim of this study is to study the effects of datum definition on the estimation of vertical velocities at the continuous GNSS stations and campaign GNSS sites. The observations have been analyzed to measure the accuracy of vertical deformations derived from GPS stations depending on the definition datum of the geodetic network. This investigati...

This study aims to determine the main tidal parameters and the regional tidal model in the south-west coasts of Turkey using the least-squares harmonic estimation method. For this purpose, the sea level data were analyzed and compared to the tides that affect sea level based on the tidal model using the tide gauge station and satellite altimetry da...

The Samos-Izmir Earthquake (Mw=6.9) of October 30, 2020 is among the strongest earthquakes that occurred in recent years throughout the Eastern Aegean. The epicenter of this earthquake was 14 km away from Samos Island and 25 km away from Gümüldür-İzmir region. The local tsunami with the wave heights reaching ~2m was triggered by the mainshock. The...

Sea level is one of the most used indicators in regional and global climate change studies as it is affected by climate events. It also affected by tectonic motion, earthquake and local effects. In order to determine sea level, two main methods are used. The first one is tide gauge that is measure sea level relative to a ground benchmark as a datum...

Human populations more than others in coastal areas in the world thanks to economic or other benefits. So, the scientists are carried out more and more studies such as sea level rise, tidal analysis, sea populations and etc. in coastal areas. In this study, we are aimed to investigate main tidal parameters effects on sea level trends in the Sou...

At present, the tide gauges and the satellite altimetry are important two main techniques for monitoring sea level trends and for determining the tidal constituents. The Tide gauges measure sea level relative to a ground benchmark as a datum, therefore, their observations are affected by local vertical ground motions. Satellite altimetry measures s...

The aim of this study is to investigate whether or not the solar activity affects the accuracy of GPS (Global Positioning System) positioning. The observations have been analyzed and compared to determine how the accuracy of derived relative positions of GPS stations rely on the baseline length, the duration of observing session in a minimum solar...

The accuracy of GPS (Global Positioning System) derived relative positions of stations depends on several factors such as the baseline length, duration of observation session, the methodology, the software for processing GPS data and employed single frequency GPS receivers used influence the results. The aim of this study is to obtain the usage of...

The aim of this study is to investigate the accuracy of GPS (Global Positioning System) positioning.The observations have been analyzed to determine how the accuracy of derived relative positions of GPS stations depends on the baseline length, the duration of observing session in different years. For this purpose, we selected three days of each yea...

As population increase in metropolitan city, we need transportation and transmission tunnel. In this context, the engineers and administors attach impotance to building and planning underground-tunnel. Moreover, we must at regular intervals monitoring to deformation in underground-tunnel for quality and safety. Firstly, a deformation monitoring net...

Recent years in the world, many practice has been performed by using PPP method. The method application has recently been widely used such as Tectonic deformations, the deformation of engineering structures or determination of displacement in ground control points and etc. Generaly in this studies is obtained from good solution. In this study, we a...

Sensitiviy, GNSS, Session duration, Displacement

Suudi Arabistan’ın Cidde şehri için planlaması yapılan Coğrafi Tabanlı Kanalizasyon Bilgi Sistemi (KBS) Projesi National Water Company, Advanced Electronics Company ve Geotech Information Ltd. ortaklığında gerçekleştirilmiştir. Bu çalışmada yaklaşık 100 personelin görev aldığı projenin pilot alınan bölgesini olan M04ile ilgili analizler yer almakta...