Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR021304 |
Spatial Variability of Soil Moisture and the Scale Issue: A Geostatistical Approach | |
Zarlenga, A.1; Fiori, A.1; Russo, D.2 | |
2018-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:3页码:1765-1780 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy; Israel |
英文摘要 | We study the standard deviation of water saturation SDS as function of the mean saturation < S > by a stochastic model of unsaturated flow, which is based on the first-order solution of the three-dimensional Richards equation. The model assumes spatially variable soil properties, following a given geostatistical description, and it explicitly accounts for the different scales involved in the determination of the spatial properties of saturation: the extent L, i.e., the domain size, the spacing Delta among measurements, and the dimension l associated to the sampling measurement. It is found that the interplay between those scales and the correlation scale I of the hydraulic properties rules the spatial variability of saturation. A "scale effect'' manifests for small to intermediate L/I, for which SDS increase with the extent L. This nonergodic effect depends on the structural and hydraulic parameters as well as the scales of the problem, and it is consistent with a similar effect found in field experiments. In turn, the influence of the scale l is to decrease the saturation variability and increase its spatial correlation. Although the solution focuses on the medium heterogeneity as the main driver for the spatial variability of saturation, neglecting other important components, it explicitly links the spatial variation of saturation to the hydraulic properties of the soil, their spatial variability, and the sampling schemes; it can provide a useful tool to assess the impact of scales on the saturation variability, also in view of the several applications that involve the saturation variability. |
英文关键词 | soil moisture geostatistical analysis scaling |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430364900020 |
WOS关键词 | ANISOTROPIC HETEROGENEOUS FORMATIONS ; STOCHASTIC-ANALYSIS ; UNSATURATED FLOW ; HYDRAULIC-PROPERTIES ; SOLUTE TRANSPORT ; FIELD-SCALE ; WATER-FLOW ; POROUS FORMATION ; MEDIA ; CONDUCTIVITY |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21765 |
专题 | 资源环境科学 |
作者单位 | 1.Roma Tre Univ, Dept Engn, Rome, Italy; 2.Agr Res Org, Volcani Ctr, Inst Soils Water & Environm Sci, Bet Dagan, Israel |
推荐引用方式 GB/T 7714 | Zarlenga, A.,Fiori, A.,Russo, D.. Spatial Variability of Soil Moisture and the Scale Issue: A Geostatistical Approach[J]. WATER RESOURCES RESEARCH,2018,54(3):1765-1780. |
APA | Zarlenga, A.,Fiori, A.,&Russo, D..(2018).Spatial Variability of Soil Moisture and the Scale Issue: A Geostatistical Approach.WATER RESOURCES RESEARCH,54(3),1765-1780. |
MLA | Zarlenga, A.,et al."Spatial Variability of Soil Moisture and the Scale Issue: A Geostatistical Approach".WATER RESOURCES RESEARCH 54.3(2018):1765-1780. |
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