Verification of the two-dimensional hydrodynamic model of the Lena River near Yakutsk by time-varying satellite data

Abstract

The article is devoted to the study of areas and flooding boundaries using methods of hydrodynamic modeling, remote sensing data and GIS-technologies. The area of the Lena River near Yakutsk (75 km) was chosen as the study object. Hydrodynamic modeling was carried out using the software package Stream_2D (Belikov, Kochetkov, 2014), which is based on solving the two-dimensional equations of Saint-Venant. The interpretation of satellite images was held in the software package ERDAS Imagine using an automated classification of k-means, which is based on the methods of cluster analysis. As a result, the dependencies of flooding areas, determined on the basis of two independent methods, were constructed on water discharge. Thus, remote sensing data allow conducting a qualitative verification of the hydrodynamic model, and the accuracy of estimates of flooding areas mainly depends not on the type of used satellite images, but on the hydrological situation, which is expressed quantitatively by water discharge, and the presence or absence of ice phenomena.