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| Titel |
Karst bare slope soil erosion and soil quality: a simulation case study |
| VerfasserIn |
Q. Dai, Z. Liu, H. Shao, Z. Yang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 3 ; Nr. 6, no. 3 (2015-07-31), S.985-995 |
| Datensatznummer |
250115507
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| Publikation (Nr.) |
 copernicus.org/se-6-985-2015.pdf |
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| Zusammenfassung |
| The influence on soil erosion by different bedrock bareness ratios,
different rainfall intensities, different underground pore fissure degrees
and rainfall duration are researched through manual simulation of
microrelief characteristics of karst bare slopes and underground karst crack
construction in combination with artificial simulation of rainfall
experiment. The results show that firstly, when the rainfall intensity is
small (30 and 50 mm h−1), no bottom load loss is produced on the surface, and
surface runoff, underground runoff and sediment production are increased with the
increasing of rainfall intensity. Secondly, surface runoff and sediment
production reduced with increased underground pore fissure degree, while
underground runoff and sediment production increased. Thirdly, raindrops hit
the surface, forming a crust with rainfall duration. The formation of crusts
increases surface runoff erosion and reduces soil infiltration rate.
This formation also increases surface-runoff-erosion-damaged crust and increased soil
seepage rate. Raindrops continued to hit the surface, leading the formation
of crust. Soil permeability showed volatility which was from reduction to
increases, reduction, and so on. Surface and subsurface runoff were
volatile with rainfall duration. Fourthly, when rock bareness ratio is
50 % and rainfall intensities are 30 and 50 mm h−1, runoff is not
produced on the surface, and the slope runoff and sediment production
present a fluctuating change with increased rock bareness ratio. Fifthly,
the correlation degree between the slope runoff and sediment production and
all factors are as follows: rainfall intensity-rainfall
duration-underground pore fissure degree–bedrock bareness ratio. |
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