Abstract
The East River in South China plays a key role in the socio-economic development in the region and surrounding areas. Adequate understanding of the hydrologic response to land use change is crucial to develop sustainable water resources management strategies in the region. The present study makes an attempt to evaluate the possible impacts of land use change on hydrologic response using a numerical model and corresponding available vegetation datasets. The variable infiltration capacity model is applied to simulate runoff responses to several land use scenarios within the basin (e.g., afforestation, deforestation, and reduction in farmland area) for the period 1952–2000. The results indicate that annual runoff is reduced by 3.5 % (32.3 mm) when 25 % of the current grassland area (including grasslands and wooded grasslands, with 46.8 % of total vegetation cover) is converted to forestland. Afforestation results in reduction in the monthly flow volume, peak flow, and low flow, but with significantly greater reduction in low flow for the basin. The simulated annual runoff increases by about 1.4 % (12.6 mm) in the deforestation scenario by changing forestland (including deciduous broadleaf, evergreen needleleaf, and broadleaf, with 15.6 % of total vegetation cover) to grassland area. Increase in seasonal runoff occurs mainly in autumn for converting cropland to bare soil.
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Acknowledgments
This research was supported by the Hong Kong RGC GRF project (HKU 710910E) and PPR project (HKU 7022-PPR-2). The first author is grateful to Dr. Ji Chen for providing financial support to attend the 8th International Conference on Hydro-Science and Engineering in Nagoya, Japan in 2008, to present some early results of this work and also for some discussions immediately after that. The authors thank the anonymous reviewer for his/her valuable comments and suggestions on the paper.
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Niu, J., Sivakumar, B. Study of runoff response to land use change in the East River basin in South China. Stoch Environ Res Risk Assess 28, 857–865 (2014). https://doi.org/10.1007/s00477-013-0690-5
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DOI: https://doi.org/10.1007/s00477-013-0690-5