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Wyświetlanie 1-3 z 3
Tytuł:
Rola katastrofalnych wezbrań w kształtowaniu morfologii koryt w małych zlewniach górskich, na przykładzie zdarzenia z maja 2014 r. w zlewni górnej Skawicy
The role of catastrophic floods in shaping the morphology of river beds in small mountain catchment areas
Autorzy:
Franczak, P.
Powiązania:
https://bibliotekanauki.pl/articles/1293358.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
zlewnie gorskie
zlewnie male
zlewnia gornej Skawicy
wezbrania wod
wezbrania powodziowe
koryta rzeczne
zmiany geomorfologiczne
extreme events
flash flood
geomorphological transformations
Carpathians
forest
Opis:
Mountain streams are subjected to continuous reshaping of their river beds during floods with the greatest changes occurring during extreme floods caused by sudden and heavy rainfall. Riverbed transformations during these flash floods are more severe in forest areas, where wooden logs carried by the swollen streams are more likely to be deposited on the ground, which in turn leads to a greater accumulation of other transported material and debris. The study was conducted in the Rybny Potok catchment area (Babia Góra National Park). An extreme flash flood occurred on 15th – 16th May 2014 due to heavy rainfall, which, on 15th May amounted to 138 mm. The total amount of precipitation in the catchment area amounted to 216.5 mm in three days. This resulted in sudden and full spate streams, contributing to significant geomorphological transformation reaching all the way to the bottoms of the river beds. During the flash flood, already established river beds and streams increased in size and many new river courses were formed.
Źródło:
Leśne Prace Badawcze; 2017, 78, 1
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wieloletnia zmienność odpływu z małej zlewni rzecznej w regionie Puszczy Kozienickiej
Long-term variability of runoff from a small catchment in the region of the Kozienice Forest
Autorzy:
Banasik, K.
Hejduk, L.
Hejduk, A.
Kaznowska, E.
Banasik, J.
Byczkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/994346.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Kozienicka
zlewnie rzek
zlewnie male
zlewnia Zagozdzonki
opady atmosferyczne
zmiennosc opadow
odplyw wody
zmiennosc odplywu
forested watershed
climate change
runoff decrease
trend analysis
Opis:
Kozienice Forest (central Poland) belongs to very valuable areas from touristic and ecological point of view. Water resources are important factor of further development of this region. Analysis of 49−year (1963−2011) annual and seasonal rainfall and runoff characteristics from a small (82 km²) catchment of Zagożdżonka River, with forestation ratio of 0.40, indicated a statistically significant decrease for six of the nine considered parameters. Mann−Kendall test was used for trend analysis. Decreased trend was indicated for annual runoff and annual runoff coefficient, median discharge, summer half−year runoff coefficient, median summer discharge and for low mean 30−day discharge. No trend was detected for annual precipitation and summer half year precipitation nor for summer half year runoff.
Źródło:
Sylwan; 2013, 157, 08; 578-586
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ pożaru lasu na czas opóźnienia odpływu bezpośredniego wód opadowych z małej zlewni w Kalabrii
Effect of forest fire on lag time of direct runoff of rainfall in a small catchment in Calabria
Autorzy:
Cogliandro, V.
Krajewski, A.
Rutkowska, A.
Porto, P.
Banasik, K.
Powiązania:
https://bibliotekanauki.pl/articles/987065.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
pozary lasow
oddzialywanie na srodowisko
zlewnie lesne
zlewnie male
wody opadowe
odplyw wody
odplyw bezposredni
Kalabria
Wlochy
forest hydrology
forest fire
rainfall−runoff
lag time
Opis:
Hydrological processes in forested areas such as runoff and erosion after heavy rainfalls are sensitive to changes in land surface properties that can be significantly modified by fire. Rainfall−runoff events recorded in a small forested catchment in Calabria (southern Italy), of area of 1.36 hectare, in the period of 2014−2015, were analyzed to check differences in lag time of direct runoff, i.e. the basic characteristics in rainfall−runoff modelling, before and after the forest fire. Lag time, defined as the elapsed time between the occurrence of the centroids of the effective rainfall intensity hyetograph and the storm runoff hydrograph, was computed with the use of two methods of effective rainfall estimation, i.e. CN−SCS (Soil Conservation Service) and Duband method. In the first one effective rainfall starts after no runoff period, when rain water is used for inter− ception, filling local depressions and high infiltration. In the other one, effective rainfall starts at the beginning of rain and then increases more gentle than in the first method. The results show that in response to the forest fire, the average lag time was reduced to 28% of the average value representative for original conditions when CN−SCS method was used (from 0.530 h before the forest fire to 0.145 h after the fire) and to 38% when the other method was used (from 0.637 h to 0.243 h, respectively). Significance of the differences in lag time was confirmed statistically with Mann−Whitney U test. The results of the investigation, i.e. reduction of lag time, and in consequence higher value and earlier appearance of peak discharge, confirm the thesis that forest fire would increase the risk of flood flows.
Źródło:
Sylwan; 2017, 161, 08; 677-684
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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