Analýza erozních poměrů povodí vodárenské nádrže Šance: srovnání výsledků metod hodnotících erozní činnosti = Analysis of soil erosion factors in the river-basin of water tank Šance: confrontation of results of methodologies observing soil erosion
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The methods recently assessing the water erosion include: monitoring of suspended sediments in water, monitoring of dynamics of soil properties, assessing the inclination of soil towards soil erosion, monitoring of effectiveness of erosion control measures, erosion processes modeling etc. The river basin of the water tank Šance is very important as a source
of potable water and this importance is advanced, when water tank is clogged up by suspended sediments. Erosion was assessed by two methods in ArcMap 9.3 working with original data: the first method is Universal equation calculating an average annual soil loss from surface (USLE); the second method assesses the potential erosion (MPE), using specific soil properties as factors, evaluating the rate of the intensity of erosion. Each method uses different ways for the description of the erodibility: USLE describes a long-term average annual soil loss as a consequence of surface erosion. It gives exact values of sediments in t.ha-1.year-1, but from the other point of view, this method is primarily created for an agricultural land. Compared with USLE, MPE solves potential erosion and gives relative values of the erosion tendency of an environment. PME could give a new point of view on the assessing of the erosion. The river basin Ostravice above water tank Šance was used to compare these two methods. As a control measure, dates of the assessment of the water sediments regime were used. This observation was pursued in waters of the gagin station ČHMÚ Ostrava in Staré Hamry. This 25-year process of measuring shows the value of 2.47 t.ha-1.year-1 in water tank upper Ostravice (with surface 72.96 km2). USLE shows much lower values of suspended sediments (0.41 t.ha-1.year-1 using a continuous longitude of slopes or 0.11 t.ha-1.year-1, with regards to the interruption of slopes by the forest roads).
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- Hlavní autor:
-
Marie Palíková
- Další autoři:
-
Aleš Kučera
- Typ dokumentu:
- Články
- Fyzický popis:
- 2 il., 6 map
- Publikováno v:
- Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis. -- ISSN 1211-8516. -- Roč. 57, č. 5 (2009), s. 229-234
- Témata:
- Popis jednotky:
- 2 tabulky
- Bibliografie:
- Literatura na s. 234
