 |
| Titel |
Assessing the hydrological effect of the check dams in the Loess Plateau, China, by model simulations |
| VerfasserIn |
Y. D. Xu, B. J. Fu, C. S. He |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 6 ; Nr. 17, no. 6 (2013-06-10), S.2185-2193 |
| Datensatznummer |
250018898
|
| Publikation (Nr.) |
 copernicus.org/hess-17-2185-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
Check dams are commonly used for soil conservation. In the Loess Plateau of
China, check dams have been widely constructed as the principal means to
retain floodwater and intercept soil sediments since the 1970s. For
instance, there are more than 6572 check dams in the Yanhe watershed with
an area of 7725 km2 in the Loess Plateau. However, little research has
been done to quantify the hydrological effects of the check dams.
In this research, the SWAT model (Soil and Water Assessment Tool) was
applied to simulate the runoff and sediment in the Yanhe watershed. We
treated the 1950s to 1960s as the reference period since there were very few
check dams during the period. The model was firstly calibrated and validated
in the reference period. The calibrated model was then used in the later
periods to simulate the hydrological effects of the check dams.
The results showed that the check dams had a regulation effect on runoff and
a retention effect on sediment. From 1984 to 1987, the runoff in rainy
season (from May to October) decreased by 1.54 m3 s−1 (14.7%) to 3.13
m3 s−1 (25.9%) due to the check dams; while in dry season (from
November to the following April), runoff increased by 1.46 m3 s−1
(60.5%) to 1.95 m3 s−1 (101.2%); the sediment in rainy season
decreased by 2.49 × 106 ton (34.6%) to 4.35 × 106 ton (48.0%).
From 2006 to 2008, the runoff in rainy season
decreased by 0.79 m3 s−1 (15.5%) to 1.75 m3 s−1 (28.9%), and the
runoff in dry season increased by 0.51 m3 s−1 (20.1%) to 0.97 m3 s−1
(46.4%); the sediment in rainy season decreased by
2.03 × 106 ton (79.4%) to 3.12 × 106 ton
(85.5%).
Construction of the large number of check dams in the Loess Plateau has
enhanced the region's capacity to control the runoff and sediment. In the
Yanhe watershed, the annual runoff was reduced by less than 14.3% due to
the check dams; and the sediment in rainy season was blocked by up to
85.5%. Thus, check dams are effective measures for soil erosion control
in the Loess Plateau. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|