recognised that over the time scale 1951–2011, the average day of the start of the
spring flood moved earlier by about 10 days (Fig. 14.2d). Such an observation,
combined with the results presented by Ignar et al. (2011) who revealed the
Fig. 14.2 Climate variability indicators recorded in the Biebrza Valley: (a) seasonal sums of
precipitation recorded in Burzyn rain gauge: 1 – summer (May–October); 2 – winter (NovemberApril); (b) annual ratios of winter and summer sums of precipitation; (c) maximum daily sums of
precipitation in summer (May–October), (d) day of the start of the snowmelt flood calculated for
floods; (e) number of floods (Q > Q 50% ) recorded in Osowiec water gauge, 3 – winter
(November–April), 4 – summer (May–October); (f) total volumes of summer floods in the
Lower Biebrza Basin (based on the Burzyn gauge). Dashed lines present general trends (Source
of data: Institute of Meteorology and Water Management (IMGW))
14 Climate-Induced Challenges for Wetlands: Revealing. . .
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spring flood moved earlier by about 10 days (Fig. 14.2d). Such an observation,
combined with the results presented by Ignar et al. (2011) who revealed the
Fig. 14.2 Climate variability indicators recorded in the Biebrza Valley: (a) seasonal sums of
precipitation recorded in Burzyn rain gauge: 1 – summer (May–October); 2 – winter (NovemberApril); (b) annual ratios of winter and summer sums of precipitation; (c) maximum daily sums of
precipitation in summer (May–October), (d) day of the start of the snowmelt flood calculated for
floods; (e) number of floods (Q > Q 50% ) recorded in Osowiec water gauge, 3 – winter
(November–April), 4 – summer (May–October); (f) total volumes of summer floods in the
Lower Biebrza Basin (based on the Burzyn gauge). Dashed lines present general trends (Source
of data: Institute of Meteorology and Water Management (IMGW))
14 Climate-Induced Challenges for Wetlands: Revealing. . .
215