干旱区生态环境知识资源中心(Arid): Accounting for field-scale heterogeneity in the ecohydrological modeling of large arid river basins: Strategies and relevance

Arid

DOI	10.1016/j.jhydrol.2021.126045
	Accounting for field-scale heterogeneity in the ecohydrological modeling of large arid river basins: Strategies and relevance
	Han, Feng; Zheng, Yi; Tian, Yong; Li, Xi; Zheng, Chunmiao; Li, Xin
通讯作者	Zheng, Y (corresponding author), Southern Univ Sci & Technol, Room 506,Block 2, Shenzhen 518055, Guangdong, Peoples R China. ; Tian, Y (corresponding author), Southern Univ Sci & Technol, Room 426,Taizhou Bldg, Shenzhen 518055, Guangdong, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	595
英文摘要	It remains a great challenge to represent field-scale (e.g., meters to tens of meters) heterogeneity in the ecohydrological modeling of large river basins due to the tradeoff between spatial resolution and computational cost. This study improved an existing ecohydrological model, HEIFLOW, by introducing the subgrid structure of land cover, multilayer soil water simulation and accurate spatial coverage of irrigation within the grid. These improvements enable the model to provide reliable simulations over a wide spectrum of spatial scales, from the field scale to the large-basin scale (i.e., 10(4) to 10(5) km(2)). The new model was implemented in the Heihe River Basin, the second largest endorheic river basin in China, with a grid size of 1 km by 1 km for a modeling domain of approximately 90,589 km(2). The major study findings include the following. First, in arid areas with sparse vegetation, ignoring the subgrid characteristics of land surfaces will lead to significant errors that may be further propagated when the modeling results are used to support management or scaled up for larger-scale climate modeling. Second, the multilayer soil structure can improve ecohydrological simulations in terms of temporal variations, and it is necessary to separate a thin surface layer from the soil zone in arid areas. In the case study, a single-layer soil structure would introduce greater than 10% error in simulating the annual maximum leaf area index (LAI). Third, considering the accurate spatial coverage of irrigation within the grid cell is critical for successful simulations of ecohydrological processes in arid areas. In the case study, accurate spatial coverage would lead to 31%, +46%, and +13% changes in the simulated average soil evaporation, transpiration and LAI, respectively, over the entire area with irrigation. Overall, this study provides a unique perspective to address the scale issue in ecohydrological modeling and reveals the importance of field-scale heterogeneity to the management of water resources and ecosystems based on ecohydrological modeling.
英文关键词	Ecohydrological modeling HEIFLOW Endorheic river basin Arid region Irrigation Spatial heterogeneity
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000641592600078
WOS关键词	CLIMATE-CHANGE ; SURFACE WATER ; GROUNDWATER ; NEXUS ; AGRICULTURE ; ECOSYSTEMS ; IMPACT
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	北京大学 ; 中国科学院青藏高原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350885
作者单位	[Han, Feng; Zheng, Yi; Tian, Yong; Zheng, Chunmiao] Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China; [Han, Feng; Zheng, Yi; Tian, Yong] Southern Univ Sci & Technol, Shenzhen Municipal Engn Lab Environm IoT Technol, Shenzhen 518055, Peoples R China; [Li, Xi] Peking Univ, Coll Engn, Beijing 100871, Peoples R China; [Li, Xin] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Han, Feng,Zheng, Yi,Tian, Yong,et al. Accounting for field-scale heterogeneity in the ecohydrological modeling of large arid river basins: Strategies and relevance[J]. 北京大学, 中国科学院青藏高原研究所,2021,595.
APA	Han, Feng,Zheng, Yi,Tian, Yong,Li, Xi,Zheng, Chunmiao,&Li, Xin.(2021).Accounting for field-scale heterogeneity in the ecohydrological modeling of large arid river basins: Strategies and relevance.JOURNAL OF HYDROLOGY,595.
MLA	Han, Feng,et al."Accounting for field-scale heterogeneity in the ecohydrological modeling of large arid river basins: Strategies and relevance".JOURNAL OF HYDROLOGY 595(2021).