impact of lucc on streamflow based on the swat model over the wei river basin on the loess plateau in china
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2017
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Abstract
Under the Grain for Green Project in China, vegetation recovery
construction has been widely implemented on the Loess Plateau for the
purpose of soil and water conservation. Now it is becoming controversial whether
the recovery construction involving vegetation, particularly forest, is
reducing the streamflow in the rivers of the Yellow River basin. In this study, we chose the Wei River, the largest branch of the Yellow River, with
revegetated construction area as the study area. To do that, we apply the
widely used Soil and Water Assessment Tool (SWAT) model for the upper and
middle reaches of the Wei River basin. The SWAT model was forced with
daily observed meteorological forcings (1960–2009) calibrated against daily streamflow for 1960–1969, validated for the period of 1970–1979, and used for analysis for 1980–2009. To investigate the impact of LUCC (land use and land cover change) on the streamflow, we firstly use two observed land use maps from 1980 and 2005 that are based on national land survey statistics
merged with satellite observations. We found that the mean streamflow
generated by using the 2005 land use map decreased in comparison with that
using the 1980 one, with the same meteorological forcings. Of particular
interest here is that the streamflow decreased on agricultural land but
increased in forest areas. More specifically, the surface runoff, soil flow,
and baseflow all decreased on agricultural land, while the soil flow and
baseflow of forest areas increased. To investigate that, we then designed
five scenarios: (S1) the present land use (1980) and (S2) 10 %,
(S3) 20 %, (S4) 40 %, and (S5) 100 % of agricultural land that was converted into
mixed forest. We found that the streamflow consistently increased with
agricultural land converted into forest by about 7.4 mm per 10 %. Our
modeling results suggest that forest recovery construction has a positive
impact on both soil flow and baseflow by compensating for reduced surface runoff, which leads to a slight increase in the streamflow in the Wei River with the mixed landscapes on the Loess Plateau that include earth–rock mountain area.
| Reference Key |
wang2017hydrologyimpact
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|---|---|
| Authors | ;H. Wang;F. Sun;J. Xia;W. Liu |
| Journal | materials research bulletin |
| Year | 2017 |
| DOI |
10.5194/hess-21-1929-2017
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| URL | |
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