Hydrogeomorphic Effects of Basin Lithology on Development of Channel Steps in First-Order Basins of the Ashio Mountains, Japan
| Autor: | Thad A. Wasklewicz, Thad Wester, Yuiko Hegi, Tsuyoshi Hattanji, Yuichi S. Hayakawa |
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| Rok vydání: | 2012 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category Groundwater flow Lithology Weathering STREAMS Structural basin Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Surface runoff Geomorphology Geology Channel (geography) General Environmental Science Colluvium |
| Zdroj: | Physical Geography. 33:536-560 |
| ISSN: | 1930-0557 0272-3646 |
| Popis: | This study focuses on lithological contrasts of headmost channel morphology of two mountainous areas underlain by chert or sandstone. The areas have contrasting runoff processes: subsurface storm flow predominates in the chert area, whereas groundwater flow recharges stable stream flow in the sandstone area. Manual field measurements from 84 sections of first-order streams revealed that channel steps develop along 26% of all sections in the chert area, while only along one section (3%) in the sandstone area. High-resolution analysis of long profiles using terrestrial laser scanning detected a weaker pattern of channel steps in a colluvial reach of the sandstone basin. The contrast in runoff processes, as well as grain-size distributions of weathering products between the two areas, influences dissimilar bed-load transport regimes and promotes spatial variations in channel profiles between headwater streams. These contrasting hydro-geomorphic processes affect channel-step morphology, indicating that lithol... |
| Databáze: | OpenAIRE |
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