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annular drainage

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См. также в других словарях:

  • annular drainage system — a drainage system arranged in a circular fashion around a central basin. See also dendritic, deranged, parallel and rectangular drainage systems …   Dictionary of ichthyology

  • annular drainage pattern —    A drainage pattern in which subsequent streams follow a roughly circular or concentric path along a belt of weak rocks, resembling in plan view, a ring like pattern where the bedrock joints or fracturing control the parallel tributaries. It is …   Glossary of landform and geologic terms

  • Drainage system (geomorphology) — In geomorphology, a drainage system is the pattern formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of the land, whether a particular region is dominated by hard or soft rocks, and the… …   Wikipedia

  • drainage system — several types of drainage system for rivers are recognised, namely annular, dendritic, deranged, parallel, rectangular and trellis (all q.v.) …   Dictionary of ichthyology

  • dendritic drainage system — the commonest type of drainage system comprising a main river with tributaries that themselves have tributaries. Such a system usually occurs on a gentle slope. See also annular, deranged, parallel, rectangular and trellis drainage systems …   Dictionary of ichthyology

  • deranged drainage system — a system without any obvious or coherent pattern as a result of much geological disturbance, as in areas cleared of soil cover by ice ages. The drainage patterns are still being determined and the glaciers left much water that accumulates in low… …   Dictionary of ichthyology

  • parallel drainage system — a pattern of rivers caused by steep slopes with some relief, often found in mountainous areas. The rivers are fast and straight with few tributaries. See also annular, dendritic, deranged, rectangular and trellis drainage systems …   Dictionary of ichthyology

  • rectangular drainage system — a system of streams arranged around faults in the ground. See also annular, dendritic, deranged, parallel and trellis drainage systems …   Dictionary of ichthyology

  • trellis drainage system — a system found where streams run parallel to structures in the bedrock with minor tributaries coming in at right angles. See also annular, dendritic, deranged, parallel and rectangular drainage systems …   Dictionary of ichthyology

  • impact crater — Astron., Geol. crater (def. 2). [1890 95] * * * ▪ landform Introduction       any feature on the continents that has been created by the impact of cosmic bodies (meteorites, asteroids (asteroid), or comets (comet)) on the Earth s surface. In fact …   Universalium

  • Headward erosion — is a fluvial process of erosion that lengthens a stream, a valley or a gully at its head and also enlarges its drainage basin. The stream erodes away at the rock and soil at its headwaters in the opposite direction that it flows. Once a stream… …   Wikipedia

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