Teknik Dergi 1300-3453 UCTEA Turkish Chamber of Civil Engineering 10.18400/tekderg.341316 Civil Engineering İnşaat Mühendisliği Augmenting in situ lake level measurements with Earth observation satellites Augmenting in situ lake level measurements with Earth observation satellites Tekeli Ahmet Emre ÇANKIRI KARATEKİN ÜNİVERSİTESİ 11 01 2018 29 6 8675 8689 10 02 2017 07 04 2018 Copyright © 1990, Teknik Dergi 1990 Teknik Dergi

Bu çalışmada, Ice, Cloud andLand Elevation Satellite (ICESat) altimetre verileri, 2008 yılında kurumuş olanAkşehir Gölü (AG)'nün su seviyelerini tespiti için MODIS kar örtüsü haritalarıile birlikte kullanılmıştır. AG’deki su seviyesi, 2004 yılında eşel seviyesininaltına düştüğü için, eşel ve ICESat-MODIS (ICEM) tabanlı göl su seviyeleri birebir karşılaştırılamamıştır. Landsat tabanlı göl yüzey alanı çalışmaları ile AGbatimetrisinin (LAB) birlikte kullanılması, ICEM tabanlı su seviyelerinindeğerlendirilebilmesine imkan sağlamıştır. ICEM ve LAB arasındaki farklar-0.09m ve 0.32m olup, sadece ICESat tabanlı çalışmaların standart sapması olan0.02m ila 0.27m değerlerine yakın olduğu görülmüştür. ICEM'in ardışık kış veilkbahar mevsimleri arasında hesaplanan minimum ve maksimum suyu seviyesideğişiklikleri 0.30m ve 1.35m olarak tarihsel gözlem aralığındadır. ICEM suseviyeleri, Ekim 2005'te rüzgar hızlarının en yüksek olduğu süre boyunca enyüksek standart sapmaları göstermiştir.

In here, Ice, Cloud and Land ElevationSatellite (ICESat) altimeter data were used with MODIS snow cover maps todetermine Akşehir Lake/wetland water levels which dried up in 2008. Since thewater level dropped below the gage in 2004, the ICESAT-MODIS (ICEM)-based lakewater levels could not be compared with gage levels. Instead, combined use ofLandsat-based lake surface area studies and Akşehir Lake bathymetry (LAB)enabled ICEM assessment. ICEM and LAB differences are between -0.09m and 0.32mand close to the standard deviations (s.d.) of pure ICESat-based studies(0.02m-0.27m). The minimum and maximum water surface elevation changes of ICEMbetween consecutive winter and spring are 0.30m and 1.35m and are in thehistorical range. ICEM showed highest s.d. during October 2005, when the windvelocities were highest.

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