Aşık, Yusuf

Barajlar, daha çok tarımsal faaliyetler, sel kontrolü, elektrik enerjisi üretimi ve diğer amaçlarla yapılırılar. Barajlar boyutları bakımından mühendislik yapıları içinde en büyük olan yapılardandır. Ayrıca önem derecesi bakımından da en önemli mühendislik yapılarındadır. Barajlar bir ülkenin ekonomik, sanayi, tarımsal, sosyal ve kültürel bakımdan kalkınmasında büyük faydaları olan yapılardır. Ancak barajlar aynı zamanda birer potansiyel tehlikedir. Çünkü bir barajın rezervuarında milyonlarca metre küp su birikmektedir. Potansiyel tehlikelere karşı barajlarda sürekli olarak gözemler yapılmalıdır. Herhangi bir tehlike karşısında da gerekli tedbirleri almak gerekir. Bu yazıda barajların güvenliği için yapılması gereken denetim ve gözlemler hakkında bilgiler verilmiştir

Karaaslan, Özge; Kayıkçı, Emine Tanır; Aşık, Yusuf

Finding the spatial extent of known height used in engineering works quite time-consuming process that requires a difficult and cost. But the less time it takes the ellipsoid heights transformation into orthometric height with GNSS measurements available and easier. It also has a certain precision and sensitivity for the conversion geoid height values must be known. This practice in Trabzon Land Registry IX. Regional Directorate of cadastral works in east-west direction of 80 km, measured orthometric and ellipsoidal heights in the 600 C3 point values created in an area 30 km long north-south direction is used. the point ITRF96 (International Terrestrial Reference Frame-International Terrestrial Reference Network) datums based on 3-dimensional Cartesian coordinates and Gauss Krüger projection coordinates are known. The study is divided into two basis points according to the method and test points. Fulcrums x and y axis directions and the distribution of points is chosen uniformly reflected by the orthometric height. In this study, the polynomial interpolation surfaces, interpolation with multiquadratic surfaces with interpolation surface obtained by the method of weighted average method is used. in selected mainstay, known aware of the ellipsoidal and the orthometric height using the calculated geoid height, calculated orthometric heights for the test points with different interpolation methods, at this point in the known calculating the difference from the known height has made comparisons between the interpolation method

Karaaslan, Özge; Tanır Kayıkçı, Emine; Aşık, Yusuf

In this study, the estimation of a local geoid model in the area of Trabzon by using geometric methods is presented. The geometric method used in this study interpolates Global Positioning System-derived ellipsoidal and orthometric heights by using the weighted average interpolation, polynomial surface regression, and multiquadratic interpolation. The orthometric and ellipsoidal heights measured at 600 C3 order control stations within a reference benchmark network covering the entire area of Trabzon in Turkey were used in this study. From the existing orthometric and ellipsoidal heights at control stations, the geoid heights were determined. Control stations were divided into two sets, namely, “reference stations” and “testing stations,” to test the estimated geoid height surface. The three methods are compared from a practical point of view by using the descriptive statistics of the root mean square error, mean absolute error, maximum error, and minimum error of the geoid height residuals.