DOI: 10.5194/hess-18-3711-2014
Scopus记录号: 2-s2.0-84907484102
论文题名: Evaluation of surface properties and atmospheric disturbances caused by post-dam alterations of land use/land cover
作者: Woldemichael A ; T ; , Hossain F ; , Pielke R ; , Sr
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 9 起始页码: 3711
结束页码: 3732
语种: 英语
Scopus关键词: Budget control
; Dams
; Heat flux
; Irrigation
; Moisture
; Potential energy
; Rivers
; Watersheds
; Wind
; Wind effects
; Atmospheric disturbance
; Convective available potential energies
; Land atmosphere interaction
; Land use/land cover
; Moisture advection
; Precipitation events
; Precipitation patterns
; Regional atmospheric modeling systems
; Land use
; atmospheric dynamics
; atmospheric modeling
; boundary layer
; dam construction
; energy budget
; land cover
; land use change
; latent heat flux
; moisture flux
; precipitation (climatology)
; water vapor
; watershed
; American River
; California
; Oregon
; Owyhee River
; United States
英文摘要: This study adopted a differential land-use/land-cover (LULC) analysis to evaluate dam-triggered land-atmosphere interactions for a number of LULC scenarios. Two specific questions were addressed: (1) can dam-triggered LULC heterogeneities modify surface and energy budget, which, in turn, change regional convergence and precipitation patterns? (2) How extensive is the modification in surface moisture and energy budget altered by dam-triggered LULC changes occurring in different climate and terrain features? The Regional Atmospheric Modeling System (RAMS, version 6.0) was set up for two climatologically and topographically contrasting regions: the American River watershed (ARW), located in California, and the Owyhee River watershed (ORW), located in eastern Oregon. For the selected atmospheric river precipitation event of 29 December 1996 to 3 January 1997, simulations of three pre-defined LULC scenarios are performed. The definition of the scenarios are (1) the "control" scenario, representing the contemporary land use, (2) the "pre-dam" scenario, representing the natural landscape before the construction of the dams and (3) the "non-irrigation" scenario, representing the condition where previously irrigated landscape in the control is transformed to the nearby land-use type. Results indicated that the ARW energy and moisture fluxes were more extensively affected by dam-induced changes in LULC than the ORW. Both regions, however, displayed commonalities in the modification of land-atmosphere processes due to LULC changes, with the control-non-irrigation scenario creating more change than the control-pre-dam scenarios. These commonalities were: (1) the combination of a decrease in temperature (up to 0.15 °C) and an increase at dew point (up to 0.25 °C) was observed; (2) there was a larger fraction of energy partitioned to latent heat flux (up to 10 W m-2) that increased the amount of water vapor in the atmosphere and resulted in a larger convective available potential energy (CAPE); (3) low-level wind-flow variation was found to be responsible for pressure gradients that affected localized circulations, moisture advection and convergence. At some locations, an increase in wind speed up to 1.6 m s-1 maximum was observed; (4) there were also areas of well-developed vertical motions responsible for moisture transport from the surface to higher altitudes that enhanced precipitation patterns in the study regions. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78126
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Tennessee Technological University, Cookeville, TN, United States; Department of Civil and Environmental Engineering, University of Washington, Washington, United States; Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, United States
Recommended Citation:
Woldemichael A,T,, Hossain F,et al. Evaluation of surface properties and atmospheric disturbances caused by post-dam alterations of land use/land cover[J]. Hydrology and Earth System Sciences,2014-01-01,18(9)