CJEES

Home
Peer Review
Editorial Board
Instructions
Online First
Latest Issue
Past Issues
Contact
Impact Factor
Reject Rate

 
You are here: Home » Online First » Volume 14, 2019 - Number 1 » APPLICATION OF SENTINEL-2 SATELLITE IMAGERY TO ASSESSMENT OF SPATIO-TEMPORAL CHANGES IN THE RESERVOIR OVERGROWTH PROCESS - A CASE STUDY: PRZEBĘDOWO, WEST POLAND, Carpathian Journal of Earth and Environmental Sciences, February 2019, Vol. 14, No. 1, p. 39 - 50; DOI:10.26471/cjees/2019/014/056


« Back

Mariusz SOJKA1, Joanna JASKUŁA1, Rafał WRÓŻYŃSKI1 & Błażej WALIGÓRSKI2
1Institute of Land Improvement, Environmental Development and Geodesy, Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland, e-mail: masojka@up.poznan.pl; jaskula@up.poznan.pl; rafal.wrozynski@up.poznan.pl, phone: +48 61 846 64 17; +48 61 846 64 23
2National Water Institute Polish Waters, Piekary 17, 61-823 Poznań, e-mail: blazej.waligorski@wzmiuw.pl,
phone: +48 61 647 52 13


APPLICATION OF SENTINEL-2 SATELLITE IMAGERY TO ASSESSMENT OF SPATIO-TEMPORAL CHANGES IN THE RESERVOIR OVERGROWTH PROCESS - A CASE STUDY: PRZEBĘDOWO, WEST POLAND, Carpathian Journal of Earth and Environmental Sciences, February 2019, Vol. 14, No. 1, p. 39 - 50; DOI:10.26471/cjees/2019/014/056

Full text

Abstract:

Water reservoirs in recent years have been subject to strong anthropogenic pressure leading to their eutrophication and overgrowing processes. The paper analyzes the temporal and spatial changes in overgrowing of the reservoir in order to identify the factors determining the dynamics of this process. The analysis was carried out on the example of Przebędowo reservoir of 12 ha, located in western Poland. 42 Sentinel-2 Level-1C satellite images from the period between the 4rd July, 2015 and 6th April, 2018 were used in the study. The analysis of reservoir overgrowth process was based on the Water Adjusted Vegetation Index (WAVI). Overgrowth process was mapped by the simple segmentation algorithm using a threshold value. The analyzes were carried out using the SNAP and ArcGIS software. The results from 42 satellite images were grouped using cluster analysis (CA). Moreover, in order to indicate the factors determining the overgrowth process in terms of time and space, the main component analysis (PCA) was used. The obtained results show that the reservoir is subject to very intensive overgrowth over the entire surface. On the other hand, the dynamics of reservoir overgrowing in a year is related to thermal conditions and to a lower degree to the water level variability. Assessment of inter-annual changes in reservoir overgrowth was impossible because of the differences in temperature and temperature distribution over the analyzed years. The CA analysis allowed a division of the images into 4 groups, which present respectively the phase of plant growth, the phase of maximum coverage with plants, the phase of plants decline and the phase of minimal coverage with plants. The PCA analysis showed that the overgrowth process is initiated from the reservoir shore, the shallowest places are occupied first. Also, along the reservoir there is a gradient of overgrowth from the inlet to the outlet of the reservoir.



Keyword: dam reservoir, Sentinel-2, WAVI, overgrowth, spatio-temporal


(c) 2006 - 2018 , Earth and Environmental Team
Design by Adrian Dorin