Assessing relative soil moisture with remote sensing data: theory, experimental validation, and application to drought monitoring over the North China Plain

Su, Zhongbo; Yacob, A.; Wen, Jun; Roerink, G.J.; He, Yuhui; Benhu, Gao; Boogaard, H.L.; Diepen, Cees van

doi:10.1016/s1474-7065(03)00010-x

Cited by 109 publications

(64 citation statements)

References 24 publications

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“…Ha sido usada en trabajos previos como indicador del estrés hídrico en cultivos (Anderson et al, 2015(Anderson et al, , 2016, sequía (Anderson et al, 2011) y de la humedad relativa del suelo (Su et al, 2003), y es el mismo concepto en el que se basan los modelos que emplean coeficientes de cultivo para estimar las necesidades hídricas de los cultivos en la programación del riego (Allen et al, 1998). En este trabajo se usa como indicador del estado hídrico en la vegetación, y se calcula (ecuación 8):…”

Section: R N =G+h+λeunclassified

Evolución de la evapotranspiración y el estrés hídrico de la vegetación de dehesa en la Península Ibérica (2001-2015)

et al. 2017

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Resumen: Este trabajo pretende profundizar en el efecto del déficit de agua en el suelo sobre la vegetación de los ecosistemas de dehesa. Para ello, se ha realizado un seguimiento de la evapotranspiración (ET) y el estrés hídrico de este sistema en la Península Ibérica a lo largo quince años, mediante la aplicación de un modelo de balance de energía basado en datos térmicos procedentes de imágenes de satélite. El modelo SEBS (Surface Energy Balance System) se ha aplicado, a escala mensual desde enero de 2001 a diciembre de 2015, haciendo uso de datos remotos e información meteorológica procedente de reanálisis. Los resultados han permitido evaluar el funcionamiento del modelo en estas condiciones usando observaciones experimentales, obteniendo estimaciones suficientemente precisas (RMSD=14-20 W·m -2 para los flujos radiativos y RMSD=26-29 W·m -2 en los convectivos) para realizar un seguimiento de los flujos de energía, incluyendo ET, y el estrés hídrico de la vegetación en las condiciones estudiadas. Se han caracterizado los principales episodios de sequía ocurridos en dicho período, cuantificando su efecto sobre la cobertura de la vegetación y su producción. Por último, se ha profundizado en el análisis de los dos años más secos de la serie (2004/2005 y 2011/2012) y su impacto sobre los diferentes estratos de vegetación, herbáceos y arbóreo, del ecosistema de dehesa.Palabras clave: evapotranspiración, balance de energía en superficie, térmico, dehesa, sequía. Evolution of evapotranspiration and water stress of oak savanna vegetation in the Iberian Peninsula (2001-2015)Abstract: The objective of this work is to provide new insights on the effect of soil water deficit on the vegetation of Mediterranean oak savanna. The evolution of evapotranspiration (ET) and vegetation water stress over this ecosystem, in the Iberian Peninsula, has been monitored for fifteen years through the application of a remote sensing thermal-based energy balance model. The Surface Energy Balance System (SEBS) has been applied, on a monthly timescale from January 2001 to December 2015, using input satellite and meteorological reanalysis databases. The model performance has been evaluated under these conditions by comparison with field measurements. The estimation of energy fluxes yielded reasonable agreements with observations (RMSD=14-20 W·m -2 for the radiative fluxes and RMSD=26-29 W·m -2 for the turbulent ones) and have led to characterize the main drought events that took place during the study period, and to quantify their effects on the vegetation coverage and production. The most generalized and severe events (2004/2005 and 2011/2012) and their impact on different vegetation strata, oaks and grasslands, are further analyzed.

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Section: R N =G+h+λeunclassified

Evolución de la evapotranspiración y el estrés hídrico de la vegetación de dehesa en la Península Ibérica (2001-2015)

et al. 2017

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“…Several remote sensing-derived drought indices depend on the ratio ET/PET, where ET is actual evapotranspiration and PET potential evapotranspiration (e.g. Crop Water Stress Index (CWSI), Jackson et al, 1981; Drought Severity Index (DSI), Su et al, 2003; Evaporative Drought Index (EDI), Anderson et al, 2007;Yao et al, 2010). While PET is generally calculated by means of ground based measurements, ET is easily estimated through "residual" methods (e.g.…”

Section: Drought Indicesmentioning

confidence: 99%

“…Even though at this stage very seldom they are used as operational tools, remote sensingderived indices are potentially very useful because they intrinsically provide space-time variation of drought phenomena, and the ratio ET/PET can be reasonably related to soil water content. For instance, the relative evaporation  r can be directly linked to the soil degree of saturation / s (Su et al, 2003). As an example, figure 14 shows the space-time evolution of the DSI, derived from SEBS and MODIS images, during summer 2006 in Northern Calabria.…”

Section: Drought Indicesmentioning

confidence: 99%

The Role of Evapotranspiration in the Framework of Water Resource Management and Planning Under Shortage Conditions

Mendicino¹,

Senatore²

2012

Evapotranspiration - Remote Sensing and Modeling

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“…By means of the data recorded by two eddy covariance stations (one located in a valley site, mainly characterised by sparse low vegetation, and the other located in a mountain zone with very high vegetation), the Surface Energy Balance Algorithm for Land (SEBAL) proposed by Bastiaanssen et al (1998) and Bastiaanssen (2000) has been validated to determine the spatially distributed evaporative fraction Λ in southern Italy (Calcagno et al 2005) in a form like this: where λE is the turbulent latent heat flux (λ is the latent heat of vaporization and E is the actual evapotranspiration), R n is the solar net radiation and G is the soil heat flux (all terms are expressed in Watts per square meter). The evaporative fraction is strictly related to the water deficit in the rooting depth, and it can be used directly (Scott et al 2003), or in a modified form (Su et al 2003) as drought index.…”

Section: Operational Definition Of Droughtmentioning

confidence: 99%

Integrated Drought Watch System: A Case Study in Southern Italy

Mendicino

Versace

2006

Water Resour Manage

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Drought is a natural hazard with varying patterns in space, time, and intensity. Because of the spatial and temporal variability and multiple impacts of drought, it is necessary to improve tools and data available for mapping and monitoring this phenomenon on all scales. Starting from some initiatives promoted by the European Community, an integrated drought watch system aimed at analysing and forecasting the effects produced by prolonged water deficit periods has been developed in southern Italy. Using GIS technologies integrated with tele-metering network, hydrological databases and distributed water balance models, it allows the analysis of different aspects of the wider drought phenomenon. Specifically, meteorological, agricultural and hydrological aspects have been together considered in a common framework according to the features required by Web-GIS applications with the aim of using Internet as a diffusion tool of the spatially distributed information managed by the system. In this paper, after a brief description of the drought watch system functionalities, the capability of detecting severe and prolonged water deficit periods have been verified in two regions in southern Italy during the last decade, considering meteorological and satellite indices together with the principal water balance components. The analysis carried out on the study area pointed out an extremely intense drought phenomenon during the period 1996-2002, characterised by a reduction in precipitation together with higher evapotranspiration values and, as a consequence, by a broad decrease in surface and groundwater runoff.

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Assessing relative soil moisture with remote sensing data: theory, experimental validation, and application to drought monitoring over the North China Plain

Cited by 109 publications

References 24 publications

Evolución de la evapotranspiración y el estrés hídrico de la vegetación de dehesa en la Península Ibérica (2001-2015)

Evolución de la evapotranspiración y el estrés hídrico de la vegetación de dehesa en la Península Ibérica (2001-2015)

The Role of Evapotranspiration in the Framework of Water Resource Management and Planning Under Shortage Conditions

Integrated Drought Watch System: A Case Study in Southern Italy

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