DOI: 10.5194/hess-18-1979-2014
Scopus记录号: 2-s2.0-84901421600
论文题名: Attribution of climate change, vegetation restoration, and engineering measures to the reduction of suspended sediment in the Kejie catchment, southwest China
作者: Ma X ; , Lu X ; X ; , Van Noordwijk M ; , Li J ; T ; , Xu J ; C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 5 起始页码: 1979
结束页码: 1994
语种: 英语
Scopus关键词: Catchments
; Climate models
; Erosion
; Land use
; Rain
; Reforestation
; Rivers
; Sediment transport
; Soil conservation
; Suspended sediments
; Uncertainty analysis
; Water conservation
; Water management
; Watersheds
; Distributed hydrological model
; Implications for futures
; Soil and Water assessment tools
; Soil and water conservation
; Suspended sediment loads
; Suspended sediment yields
; Vegetation restoration
; Watershed management
; Climate change
; bank erosion
; catchment
; climate change
; fluvial deposit
; hillslope
; human activity
; hydrological modeling
; policy making
; reforestation
; restoration ecology
; river bank
; river channel
; sediment transport
; sediment yield
; soil conservation
; suspended sediment
; water storage
; watershed
; China
; Salween River
; Yunnan
英文摘要: Suspended sediment transport in rivers is controlled by terrain, climate, and human activities. These variables affect hillslope and riverbank erosion at the source, transport velocities and sedimentation opportunities in the river channel, and trapping in reservoirs. The relative importance of those factors varies by context, but the specific attribution to sediment transfer is important for policymaking, and has wide implications on watershed management. In our research, we analyzed data from the Kejie watershed in the upper Salween River (Yunnan Province, China), where a combination of land cover change (reforestation, as well as soil and water conservation measures) and river channel engineering (sand mining and check dam construction) interact with a changing climate. Records (1971-2010) of river flow and suspended sediment loads were combined with five land-use maps from 1974, 1991, 2001, 2006 and 2009. Average annual sediment yield decreased from 13.7 tha-1 yr -1 to 8.3 tha-1 yr-1 between the period 1971-1985 and the period 1986-2010. A distributed hydrological model (Soil and Water Assessment Tools, SWAT) was set up to simulate the sediment sourcing and transport process. By recombining land-use and climate data for the two periods in model scenarios, the contribution of these two factors could be assessed with engineering effects derived from residual measured minus modeled transport. Overall, we found that 47.8% of the decrease was due to land-use and land cover change, 19.8% to climate change, resulting in a milder rainfall regime, 26.1% to watershed engineering measures, and the remaining 6.3% was due to the simulation percent bias. Moreover, mean annual suspended sediment yield decreased drastically with the increase of forest cover, making diverse forest cover one of the most effective ecosystems to control erosion. For consideration of stakeholders and policymakers, we also discuss at length the modeling uncertainty and implications for future soil and water conservation initiatives in China. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78234
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Mountain Ecosystem Studies, Kunming Institute of Botany, Kunming, 650204, China; World Agroforestry Centre, East and Central Asia Region, Kunming, 650204, China; Yunnan Institute of Environmental Sciences, Kunming, 650034, China; Department of Geography, National University of Singapore, 117570 Singapore, Singapore; World Agroforestry Centre, Southeast Asia, Bogor 16001, Indonesia; Baoshan Water Resource and Hydrological Bureau, Baoshan, 678000, China
Recommended Citation:
Ma X,, Lu X,X,et al. Attribution of climate change, vegetation restoration, and engineering measures to the reduction of suspended sediment in the Kejie catchment, southwest China[J]. Hydrology and Earth System Sciences,2014-01-01,18(5)