|Response of variation of water and sediment to landscape pattern in the Dapoling Watershed
|Wei, C., Z. Zhang, Z. Wang, L. Cao, Y. Wei, X. Zhang, R. Zhao, L. Xiao and Q. Wu
|URL (non-DOI journals):
|SWAT-VRR & SWAT
|Broad Application Category:
|hydrologic and pollutant
|Primary Application Category:
|modified runoff curve number approach
|Secondary Application Category:
|model and/or data comparison
|Dapoling River, located at the source of the Huaihe River in northeast China.
|The relationship between water-sediment processes and landscape pattern changes has
currently become a research hotspot in low-carbon water and land resource optimization research.
The SWAT-VRR model is a distributed hydrological model which better shows the effect of land
use landscape change on hydrological processes in the watershed. In this paper, the hydrological
models of the Dapoling watershed were built, the runoff and sediment yield from 2006 to 2011 were
simulated, and the relationship between landscape patterns and water-sediment yield was analyzed.
The results show that the SWAT-VRR model is more accurate and reasonable in describing runoff
and sediment yield than the SWAT model. The sub-basins whose soil erosion is relatively light
are mostly concentrated in the middle reaches with a slope mainly between 0–5. The NP, PD, ED,
SPIIT, SHEI, and SHDI of the watershed increased slightly, and the COHESION, AI, CONTAG, and
LPI showed a certain decrease. The landscape pattern is further fragmented, with the degree of
landscape heterogeneity increasing and the connection reducing. The runoff, sediment yield and
surface runoff are all extremely significantly negatively correlated with forest, which implies that for
more complicated patch shapes of forest which have longer boundaries connecting with the patches
of other landscape types, the water and sediment processes are regulated more effectively. Therefore,
it can be more productive to carry out research on the optimization of water and soil resources under
the constraint of carbon emission based on the SWAT-VRR model.
|watershed modeling; hydrological model; SWAT-VRR; landscape pattern; carbon emission