Use of remote sensing data in investigations of ecological state of water bodies in urban area of Kyiv City

Abstract

There are several hundreds of water bodies within the territory of Kyiv city. The biggest river is the Dnipro with many small urban rivers, lakes and ponds. Upstream of the city on the Dnipro river the Kyivske reservoir was constructed. Near the city another big river Desna flows into the Dnipro river. The ecological states of these water bodies differ greatly and it is worthy to note that the routine monitoring of these objects is irregular and limited. This resulted in the need of applying a new approach to the investigation of their ecological states. The investigation included field studies, using and processing of high-quality satelite images as well as analysing some hydrometeorological data. The field studies were carried simultaneously with the satellite survey. This enabled to get some dependences between measured and calculated data. Some patterns regarding water temperature, ice regime, water transparency, algal bloom as well as the ecological state of water objects in a whole were obtained. The Kyivske reservoir located upstream is an essential factor impacting on the Dnipro river and its gulfs. Another important factor which has a great effect on the ecological states of water objects is water exchange in them. In general, the ecological state of water bodies, connected with the Dnipro river is much better, than those without that connection.