REMOTE SENSING METHODS USING FOR THE UNDERGROUND WATER LEVEL ANALYSIS IN OVIDIOPOL AREA OF ODESSA REGION

Abstract

Problems statement and purpose. The studied area has a high level of agricultural development. There are different irrigation and drainage systems located there. As re­sult, the underground water level is under intense technogenic impact. Evaluation and approbation of underground water level changes control methods with remote sensing methods for Ovidiopol area is the main goal of that work. The object of study is the groundwater level regime in local sites of the Lower Dniester irrigation system in Ovidiopol district, Odessa region. The subject of research is the water indexes, which are calculated on remote sensing results.Data and methods. The local system of underground water observation includes 7 drillholes in Nadlimanskoe village and around. These drillholes located in different geomorphological, hydrogeological and technogenic conditions. Underground water level have been studied each month in 2017 year. Sentinel-2 2A images for each month from March 2017 to December 2017 were used for studied area. All satellite images has atmospheric correlation. Three water indexes NDWI, MNDWI, NDPI were calculated for drillhole points for each month in 2017 year.Results. Significant coefficients of correlation were obtained in comparison between underground water level changes and water indexes in some drillholes points. The highest numbers of correlation connected with free of construction areas and for drill­holes, which are located outside the villages. Water indexes have the same dynamics of changing as groundwater level. NDWI is the most informative and representative index for studied area. Other types of indexes should be used for build-up areas analy­ses. However, existed water indexes can be used for underground water level analyses in the open fields and in river slopes and valleys.