Application ofsatellite data for investigation of micro depressionsof relief source of the groundwater pollution by mineral fertilizers
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2021-03-28 05:16
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ROMANCIUC, Inna. Application ofsatellite data for investigation of micro depressionsof relief source of the groundwater pollution by mineral fertilizers. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 105.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Application ofsatellite data for investigation of micro depressionsof relief source of the groundwater pollution by mineral fertilizers


Pag. 105-105

Romanciuc Inna
 
SI "Scientific Centre for Aerospace Research of the Earth of the Institute of Geological Science of the NASU"
 
 
Disponibil în IBN: 11 martie 2019


Rezumat

Micro depression of relief (also called ponds) are typical for the forest-steppe zone, where prevails loess soil. According to hydrological research the micro ponds appeared on the topsoil and serve as connecting elements between surface water and groundwater. They perform the basic function of groundwater recharging and alimentation. In the most often cases this lead to the contamination of groundwater with nitrates. Surface water streams eliminate topsoil into the micro ponds, where the concentration of fertilizers used within fields is in the process of permanent increasing. In many cases, the ponds representa source of groundwater contamination with nitrates. Sooner or later, nitrates migrating withgroundwater fall into the rivers and lakes and penetrate into the groundwater. The satellite imagery data was used to carry on the study of soil degradation processes, studying of soil moisture, storage and distribution of fertilizers in ponds. The combination of ground survey and satellite imagery data permits to reveal and determine the processes of development and formation of ponds.Studied ponds were located in the production fields of wheat, sunflower and corn.During the study were selected soil samples, were calculated amounts of moisture contained in the soil and chemical composition.The results of ground survey were compared with satellite imagery Sentinel-1 and Sentinel-2, relating to the period of works.Soil samples were collected according to their profile: the center point of pond, slope and watershed.Processing images included next classification types: Maximum Likelihood, Mahalanobis Distance, Minimum Distance method. Were calculatednext indices: Normalized Difference Vegetation Index (NDVI), Water Band Index (WBI), Normalized Difference Water Index (NDWI) As a result of research detecting soil moisture we can see that in the center of ponds the humiditydepression is higher on 4-6% than on the slope, and humidity on the slope is on 7-10% higher than on the watershed. Besides, therevealed changes in the type of soil and the type of vegetation appeared in the center of hearth. The soil become more waterlogging and vegetation boggier, such as: cane (Scírpus), euphorbiapalustris, moss (Bryophyta). Inresults of processing image data were determined the percentage of ponds within the field and the diameters of the most disadvantaged ponds. The surface of 40-80% within the same field was occupied by ponds, from which the largest one covers area of 70 m. The Sentinel-1 and Sentinel-2 satellite imagery permit successfully determine the micro depressions of relief. The most unfavorable agricultural fields are considered those, which reach the maximum number of ponds starting with 70% and above. Such big amount of ponds leads to heavy pollution of groundwater. In such fields is strictly needed the adjustment offertilizer’s amount used or introduction the alternative methods to increase its productivity.