Abstract
Since 2000, the network of stations that make up the Czech Hydrometeorological Institute (CHMI) has measured the soil moisture content at the 0- to 0.9-m layer using sensors placed within the natural soil profile under closely cropped grass cover. Using information from 8 years of continuous observation at seven stations throughout the Czech Republic, we verified the usefulness of the Soil Moisture Index (SMI). The SMI is a potentially useful index for calculating the water deficit in the Czech Republic and Central Europe. During this period, a statistically significant decrease in moisture content was detected, and negative SMI values predominated. There were frequent occurrences of flash drought, defined as a very rapid decline in soil moisture during a 3-week period. The CHMI can use SMI values below −3 in the Integrated Warning Service System. The routine calculation of SMI values can alert agricultural producers to the development of flash drought conditions and provide them with information regarding the effectiveness of recent rainfall events. An increase in soil moisture, in contrast, could serve as a warning sign for hydrology because it creates the preconditions for flooding. The complex study of soil humidity regimes is becoming more significant in connection with current global climatic change warnings in hydrological cycles.
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We gratefully acknowledge the support of the Ministry of education, youth and sports project OC10010 and National Agency for Agriculture Research project Q191C054.
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Mozny, M., Trnka, M., Zalud, Z. et al. Use of a soil moisture network for drought monitoring in the Czech Republic. Theor Appl Climatol 107, 99–111 (2012). https://doi.org/10.1007/s00704-011-0460-6
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DOI: https://doi.org/10.1007/s00704-011-0460-6