Development of digital elevation models for shallow-water zones and coastal areas of Lake Baikal, the Irkutsk reservoir and the downstream pool of Irkutsk HPP
A.E. HMELNOV, A.S. GACHENKO
Matrosov Institute for System Dynamics and Control Theory, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia
Keywords: contour lines, constrained Delaunay triangulation, map morphing, coastline, floods, remote sensing of the Earth
Abstract
In this article we consider the results from developing digital elevation models of shallow-water zones and coastal areas which can be potentially damaged due to changes in water level for particular sites on the shores of Lake Baikal, the Irkutsk reservoir and Angara river in the downstream pool of the Irkutsk hydroelectric power plant, which are needed for implementation of the project to assess the impact of regulation of the water level in Lake Baikal. When solving problems that take into account changes in the water level, it is necessary to use a combined relief model that unites surface and underwater relief. We consider the experience gained in the construction of combined relief models for such water bodies as the Irkutsk and Bratsk reservoirs as well as Lake Baikal. When building the combined relief model we tried to use all available data on the relief: topographic and pilot maps, the results of depth measurements using the echo sounder, and coastline contours identified using satellite images. We have developed several algorithms based on the use of Delaunay triangulation to combine data from various sources. A registry of key areas has been compiled for which it is necessary to perform additional data collection in order to update the coastal relief. We also consider techniques for obtaining digital surface models by using unmanned aerial vehicles of various types: quadcopters and aircraft-type drones. Currently we are carrying out digital aerial photography of selected key areas, where it is required to refine their terrain models.
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