 |
| Titel |
Runoff formation from experimental plot, field, to small catchment scales in agricultural North Huaihe River Plain, China |
| VerfasserIn |
S. Han, D. Xu, S. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 9 ; Nr. 16, no. 9 (2012-09-05), S.3115-3125 |
| Datensatznummer |
250013457
|
| Publikation (Nr.) |
 copernicus.org/hess-16-3115-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Runoff formation at an experimental plot (1600 m2),
a field (0.06 km2), and a small catchment (1.36 km2) with a
shallow groundwater table and a dense drainage system in the agricultural North
Huaihe River Plain (China) was analysed based on the observed rainfall,
runoff, and groundwater table data of 30 storm events that occurred during
the 1997 to 2008 flood seasons. The surface runoff was collected and
measured at the outlet of the furrow of the experimental plot, whereas the
total runoff was collected and measured at the outlets of the drainage
ditches of the field and the small catchment. The present study showed that
the relatively narrow range of rainfall amounts resulted in significantly
different runoff amounts at the 3 scales. When the groundwater is close to
the surface, the runoff amount is a large percentage of the total rainfall.
The difference in rainfall and runoff amounts was regressed against changes
in the groundwater table, and a significant linear relationship was
determined. Significant rainfall-runoff relationships were indicated for
the events divided into 3 groups according to the initial groundwater table
depths (as indicators of the antecedent moisture conditions): less than
0.5 m, more than 2.1 m, or between 0.5 m and 2.1 m. These findings suggest
that saturation excess surface flow dominated the runoff response,
particularly when the groundwater table was shallow. For almost all events,
the groundwater table rose above the bottom of the drainage ditch. The total
runoff amounts were larger both at the field and at the catchment than at
the plot with only the surface runoff collected, which shows a considerable
contribution of subsurface flow. Groundwater table depth, which indicates
antecedent moisture conditions and influences lateral sub-surface flow to
the drainage ditches, is an important parameter that influences runoff
formation in catchments, including the study area with a shallow groundwater
table and a dense drainage system. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|