气候变化领域集成服务门户(CCPortal): Soil moisture sensor network design for hydrological applications

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DOI	10.5194/hess-24-2577-2020
	Soil moisture sensor network design for hydrological applications
	Zhuo L.; Dai Q.; Zhao B.; Han D.
发表日期	2020
ISSN	1027-5606
起始页码	2577
结束页码	2591
卷号	24 期号:5
英文摘要	Soil moisture plays an important role in the partitioning of rainfall into evapotranspiration, infiltration, and runoff, hence a vital state variable in hydrological modelling. However, due to the heterogeneity of soil moisture in space, most existing in situ observation networks rarely provide sufficient coverage to capture the catchment-scale soil moisture variations. Clearly, there is a need to develop a systematic approach for soil moisture network design, so that with the minimal number of sensors the catchment spatial soil moisture information could be captured accurately. In this study, a simple and low-data requirement method is proposed. It is based on principal component analysis (PCA) for the investigation of the network redundancy degree and K-means cluster analysis (CA) and a selection of statistical criteria for the determination of the optimal sensor number and placements. Furthermore, the long-term (10-year) 5 km surface soil moisture datasets estimated through the advanced Weather Research and Forecasting (WRF) model are used as the network design inputs. In the case of the Emilia-Romagna catchment, the results show the proposed network is very efficient in estimating the catchment-scale surface soil moisture (i.e. with NSE and r at 0.995 and 0.999, respectively, for the areal mean estimation; and 0.973 and 0.990, respectively, for the areal standard deviation estimation). To retain 90% variance, a total of 50 sensors in a 22 124 km2 catchment is needed, and in comparison with the original number of WRF grids (828 grids), the designed network requires significantly fewer sensors. However, refinements and investigations are needed to further improve the design scheme, which are also discussed in the paper. © 2020 Author(s).
语种	英语
scopus关键词	Catchments; Cluster analysis; K-means clustering; Moisture control; Runoff; Sensor networks; Weather forecasting; Hydrological modelling; In-situ observations; Moisture variation; Soil moisture networks; Soil moisture sensors; Statistical criterion; Surface soil moisture; Weather research and forecasting models; Soil moisture; catchment; heterogeneity; hydrological modeling; hydrological response; network design; principal component analysis; sensor; soil moisture; weather forecasting; Emilia-Romagna; Italy; Emilia
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159401
作者单位	Zhuo, L., Key Laboratory of VGE of Ministry of Education, Nanjing Normal University, Nanjing, China, Department of Civil and Structural Engineering, University of Sheffield, Sheffield, United Kingdom; Dai, Q., Key Laboratory of VGE of Ministry of Education, Nanjing Normal University, Nanjing, China, Jiangsu Ctr. for Collab. Innovation in Geographical Information Resource Development and Application, Nanjing, China; Zhao, B., Key Laboratory of VGE of Ministry of Education, Nanjing Normal University, Nanjing, China; Han, D., WEMRC, Department of Civil Engineering, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Zhuo L.,Dai Q.,Zhao B.,et al. Soil moisture sensor network design for hydrological applications[J],2020,24(5).
APA	Zhuo L.,Dai Q.,Zhao B.,&Han D..(2020).Soil moisture sensor network design for hydrological applications.Hydrology and Earth System Sciences,24(5).
MLA	Zhuo L.,et al."Soil moisture sensor network design for hydrological applications".Hydrology and Earth System Sciences 24.5(2020).