In:
Soil Science Society of America Journal, Wiley, Vol. 81, No. 6 ( 2017-11), p. 1517-1525
Abstract:
Core Ideas Generation of overland flow from 6.5 (control) and 10° lagged 30 min behind rainfall peaks, whereas the other slope gradients investigated synchronized with rainfall peaks. Interflow comprised between 83 and 91% of total runoff. The relationship of sediment loss flux and discharge of overland flow can be simulated by the power function and the S function. This study investigated the hydrological processes of overland flow and interflow for slope gradients of 6.5°, 10, 15, 20, and 25° on hillslope croplands of Regosol under natural rainfall conditions. The generation of overland flow from 6.5° (control) and 10° lagged 30 min behind the rainfall peaks, whereas the other investigated slope gradients were synchronized with the rainfall peaks. Moreover, the soil moisture varied (and interflow was generated) from 25 to 35% in association with increasing slope gradients (from 6.5 to 10, 15, 20, and 25°). The times and peaks of sediment yields corresponded to the overland flow. The total storm runoff discharge averages for the 6.5°, 10, 15, 20, and 25° slope gradients were 39.9 ± 3.1, 45.1 ± 4.2, 48.7 ± 2.9, 51.8 ± 3.0, and 43.9 ± 3.6 mm, respectively, with runoff coefficients between 47 and 61%. Interflow comprised between 83 and 91% of the total runoff. Moreover, overland flow and sediment yield discharge for the 15 and 20° slope gradients exhibited significant differences ( p 〈 0.05) from the control (6.5°) and two other gradients (10 and 25°). This study determined that the apparent critical slope gradient for overland flow and sediment yield was between 15 and 20°. Moreover, the relationship of sediment loss flux and the discharge of overland flow can be simulated by the power function and the S function. However, the results showed that slope gradients do not significantly impact interflow, which could be influenced by soil moisture prior to the occurrence of rain.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2017.03.0085
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
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