Augmenting in situ lake level measurements with Earth observation satellites

Öz

Bu çalışmada, Ice, Cloud and Land Elevation Satellite (ICESat) altimetre verileri, 2008 yılında kurumuş olan Akşehir Gölü (AG)'nün su seviyelerini tespiti için MODIS kar örtüsü haritaları ile birlikte kullanılmıştır. AG’deki su seviyesi, 2004 yılında eşel seviyesinin altına düştüğü için, eşel ve ICESat-MODIS (ICEM) tabanlı göl su seviyeleri bire bir karşılaştırılamamıştır. Landsat tabanlı göl yüzey alanı çalışmaları ile AG batimetrisinin (LAB) birlikte kullanılması, ICEM tabanlı su seviyelerinin değerlendirilebilmesine imkan sağlamıştır. ICEM ve LAB arasındaki farklar -0.09m ve 0.32m olup, sadece ICESat tabanlı çalışmaların standart sapması olan 0.02m ila 0.27m değerlerine yakın olduğu görülmüştür. ICEM'in ardışık kış ve ilkbahar mevsimleri arasında hesaplanan minimum ve maksimum suyu seviyesi değişiklikleri 0.30m ve 1.35m olarak tarihsel gözlem aralığındadır. ICEM su seviyeleri, Ekim 2005'te rüzgar hızlarının en yüksek olduğu süre boyunca en yüksek standart sapmaları göstermiştir.

Anahtar Kelimeler

• ICESat,GLA14,lazer altimetresi,Akṣehir Gölü,Su seviyesi,MODIS

Augmenting in situ lake level measurements with Earth observation satellites

Öz

In here, Ice, Cloud and Land Elevation Satellite (ICESat) altimeter data were used with MODIS snow cover maps to determine Akşehir Lake/wetland water levels which dried up in 2008. Since the water level dropped below the gage in 2004, the ICESAT-MODIS (ICEM)-based lake water levels could not be compared with gage levels. Instead, combined use of Landsat-based lake surface area studies and Akşehir Lake bathymetry (LAB) enabled ICEM assessment. ICEM and LAB differences are between -0.09m and 0.32m and 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 ICEM between consecutive winter and spring are 0.30m and 1.35m and are in the historical range. ICEM showed highest s.d. during October 2005, when the wind velocities were highest.

 

Anahtar Kelimeler

• ICESat,GLA14,laser altimeter,Akṣehir Lake,Water level,MODIS,Landsat

Kaynakça

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