Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China

doi:10.1029/2017MS001264

	Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China
	Chang, XL (Chang, X. L.)1; Liang, J (Liang, J.)1; Zhang, YL (Zhang, Y. L.)1; Li, X (Li, X.)2,3; Cheng, GD (Cheng, G. D.)3,4,5; Jin, HJ (Jin, H. J.)4,6; Yang, DW (Yang, D. W.)7; Flerchinger, GN (Flerchinger, G. N.)8; Wang, X (Wang, X.)1
刊名	JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
	2018-07-01
卷号	10 期号:7 页码:1439-1457
关键词	HEIHE RIVER-BASIN WIRELESS SENSOR NETWORK SOLAR-RADIATION MODEL QINGHAI-TIBET PLATEAU SKY-VIEW FACTOR LAND-SURFACE SIMULTANEOUS HEAT FROZEN SOIL REFERENCE EVAPOTRANSPIRATION COMPLEX TOPOGRAPHY
ISSN号	1942-2466
DOI	10.1029/2017MS001264
英文摘要	The solar radiation incident in a mountainous area with a complex terrain has a strong spatial heterogeneity due to the variations in slope orientation (self-shading) and shadows cast by surrounding topography agents (topographic shading). Although slope self-shading has been well studied and considered in most land surface and hydrological models, topographic shading is usually ignored, and its influence on the thermal and hydrological processes in a cold mountainous area remains unclear. In this study, a topographic solar radiation algorithm with consideration for both slope self-shading and topographic shadows has been implemented and incorporated into a distributed hydrological model with physically based descriptions for the energy balance. A promising model performance was achieved according to a vigorous evaluation. In a control model without considering the topographic shadows, the simulated solar radiation incident in the study area was about 14.3W/m(2) higher on average, which in turn led to a higher simulated annual mean ground temperature at 4m (by 0.41 degrees C) and evapotranspiration (by 16.1mm/a), and a smaller permafrost extent (reduced by about 8%), as well as smaller maximal snow depth and shorter snow duration. Although the simulation was not significantly improved for discharge hydrograph in the base model, higher river runoff peaks and an increased runoff depth were obtained. In areas with a rugged terrain and deep valleys, the influences of topographic shadows would even be stronger in reality than the presented results, which cannot be ignored in the simulation of the thermal and hydrological processes, especially in a refined model.
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000441886300004
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8604]
专题	青藏高原研究所_图书馆
作者单位	1.Hunan Univ Sci & Technol, Natl Local Joint Engn Lab Geospatial Informat Tec, Xiangtan, Peoples R China; 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China; 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China; 4.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China; 5.[Cheng, G. D.] Shanghai Normal Univ, Inst Urban Study, Shanghai, Peoples R China; 6.Harbin Inst Technol, Sch Civil Engn, Harbin, Heilongjiang, Peoples R China; 7.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing, Peoples R China; 8.USDA ARS, Northwest Watershed Res Ctr, Boise, ID 83712 USA.
推荐引用方式 GB/T 7714	Chang, XL ,Liang, J ,Zhang, YL ,et al. Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China[J]. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,2018,10(7):1439-1457.
APA	Chang, XL .,Liang, J .,Zhang, YL .,Li, X .,Cheng, GD .,...&Wang, X .(2018).Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China.JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS,10(7),1439-1457.
MLA	Chang, XL ,et al."Influences of Topographic Shadows on the Thermal and Hydrological Processes in a Cold Region Mountainous Watershed in Northwest China".JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 10.7(2018):1439-1457.