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001-es BibID:	BIBFORM019220
Első szerző:	Novák Tibor (geográfus)
Cím:	A Hortobágy tájföldrajzi jellemzése / Novák Tibor József
Dátum:	2010
Megjegyzések:	As part of the Middle-Tisza region on the Great Hungarian Plain the Hortobágy could be defined as a very shallow basin surrounded by landscapes lying just 3-15 m higher. This shallow basin is open only from the north, wherefrom floods of the Tisza incame to the Hortobágy (until the water regulations), and from the southwest where surface waters could run off into the Berettyó river. The mean elevation of the area is between 87-92 m above the sea level, its extension is 1700 km2. Flat surface, the poverty of geomorphological features and very small elevation differences (meanly 1-3 m/km2) characterize the landscape. The tectonic basin of the Hungarian Great Plain was first filled up with marine and lacustric sediments until the late tercier. Since the ?Pannonian Sea" was filled up, and dried for 5 million years, continued the sedimentation with fluvial and aeolic sediments. Several rivers ? mostly the Sajó and Hernád ? deposited their sandy and silty sediments in the Hortobágy during the pleistocene, and formed typical geomorphological features of floodplains including scour channels, oxbows, point bars, natural levees and backswamps. During interglacials ? warm and wet periods ?the surface was formed by fluvial processes. In ice ages aeolian processes dominated: loess strata covered the fluvial surface. Because of the alteration of fluvial and aeolic surface forming loess was partially washed away, and transported by later fluvial processes (infusion loess). Even since the Tisza cut off the rivers Sajó and Hernád (22 000- 25 000 years BP), it has not developed more as an active floodplain: it became a quasi-fossilized floodplain character. Former geomorphological features were levelled away by the floods of Tisza, but its poor energy and sediment transport could not change significantly the former surface. Negative forms were filled up by local, partially biogenic processes, while positive forms were eroded by stagnant waters and precipitation. On alkaline soils rich microrelief occurs, which is caused by erosion processes of solonetz soils. These erosion processes reduced the elevation differences as well.
Tárgyszavak:	Természettudományok Földtudományok magyar nyelvű folyóiratközlemény hazai lapban Hortobágy geomorphology microrelief erosion of solonetz
Megjelenés:	Acta biologica Debrecina. Supplementum oecologica Hungarica. - 24 : 1 (2010), p. 11-19. -
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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