Monin–Obukhov length as a cornerstone of the SEBAL calculations of evapotranspiration

Koloskov, G.B; Mukhamejanov, K.; Tanton, T.W.

doi:10.1016/j.jhydrol.2006.11.010

Cited by 18 publications

(13 citation statements)

References 13 publications

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“…The roughness height for momentum transfer (z 0m ) and the zero displacement height (d 0 ) play a vital role in the Monin-Obukhov Similarity theory (MOS) (Equations (3) and (4)). These two parameters significantly influence the momentum transfer between the evaporating surface and the atmosphere [12]; z 0m is the height up to which the momentum transfer is affected by surface characteristics [18]. Despite that this parameter is related to wind speed, atmospheric stratification and other factors, z 0m can be considered as a constant value over water bodies [19].…”

Section: Water Heat Flux (G 0w )mentioning

confidence: 99%

“…Not simulating or predicting these processes properly can even lead to large-scale economic problems. For example, a large decrease in air temperature caused by lower-salinity (and consequently low-temperature) ocean currents may lead to a delay of the spring phytoplankton growth [12], directly affecting the zooplankton growth and fish recruitment.…”

Section: Introductionmentioning

confidence: 99%

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Surface Energy Balance of Fresh and Saline Waters: AquaSEBS

et al. 2016

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Abstract:Current earth observation models do not take into account the influence of water salinity on the evaporation rate, even though the salinity influences the evaporation rate by affecting the density and latent heat of vaporization. In this paper, we adapt the SEBS (Surface Energy Balance System) model for large water bodies and add the effect of water salinity to the evaporation rate. Firstly, SEBS is modified for fresh-water whereby new parameterizations of the water heat flux and sensible heat flux are suggested. This is achieved by adapting the roughness heights for momentum and heat transfer. Secondly, a salinity correction factor is integrated into the adapted model. Eddy covariance measurements over Lake IJsselmeer (The Netherlands) are carried out and used to estimate the roughness heights for momentum (~0.0002 m) and heat transfer (~0.0001 m). Application of these values over the Victoria and Tana lakes (freshwater) in Africa showed that the calculated latent heat fluxes agree well with the measurements. The root mean-square of relative-errors (rRMSE) is about 4.1% for Lake Victoria and 4.7%, for Lake Tana. Verification with ECMWF data showed that the salinity reduced the evaporation at varying levels by up to 27% in the Great Salt Lake and by 1% for open ocean. Our results show the importance of salinity to the evaporation rate and the suitability of the adapted-SEBS model (AquaSEBS) for fresh and saline waters.

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Section: Water Heat Flux (G 0w )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Energy Balance of Fresh and Saline Waters: AquaSEBS

et al. 2016

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“…The soil heat flux was computed using a relationship between the net radiation, surface temperature, surface albedo and NDVI, Kustas, et al, 2004 ⎟ Koloskov (2007), however, observed that, over a 24-hour period, the soil heat flux could relatively be small and can be ignored without introducing significant errors in the computation process.…”

Section: Soil Heat Fluxmentioning

confidence: 99%

Using satellite remote sensing to assess evapotranspiration: Case study of the upper Ewaso Ng’iro North Basin, Kenya

Mutiga¹,

Su²,

Woldai³

2010

International Journal of Applied Earth Observation and Geoinfor

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ABSTRACT:Actual Evapotranspiration (ET a ) is one of the most useful indicators to explain whether the water is being used as "intended". ET a variations, both in space and time and from different land use types are seen to be highly indicative for the adequacy, reliability and equity in water use; the knowledge of these terms is essential for judicious water resources management. Unfortunately, ET a estimation under actual field conditions is still a big challenge to both scientists and water managers. The complexity associated with the estimation of ET a has lead to the development of various methodological approaches for estimating it over time.During the last two to three decades, significant progress has been made to estimate actual evapotranspiration using satellite remote sensing These methods provide a powerful means to compute ET a from pixel to the entire basin scale. In this study, Surface Energy Balance Algorithm for Land (SEBAL) was used to compute a complete radiation and energy balance along with the resistances for momentum, heat and water vapour transport for each pixel and then applied to assess the ET a at the basin scale and subsequently carryout a simple water balance for the basin. This was done for the Upper Ewaso Ng'iro North River Basin, in Kenya. Landcover/ landuse for 2000, 2003 and 2006 were assessed and compared with ET a for the same periods and a significant correlation was established. The ET a values obtained for the three time periods was used to analyse water use patterns across the basin thus giving insights on the underlying factors impacting on the water resources of the basin and hence facilitating the formulation of appropriate water resources management strategies for the basin.

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“…Kriging approaches are commonly considered favourable when compared to local approaches such as inverse distance and isohyets procedures. Kriging approaches are based on the theory of regionalized variables (Journel and Huijbregts 1978;Goovaerts 1999;Sen and Habib 2000) and rely on a semi-variogram that describes spatial dependency between observations. Furthermore, estimates are not largely affected by the presence of clustered data and as such Kriging algorithms are called Best Linear Unbiased Estimators (BLUE).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Water Availability and Consumption in the Karkheh River Basin, Iran—Using Remote Sensing and Geo-statistics

Muthuwatta

Ahmad

Bos

et al. 2009

Water Resour Manage

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This study was conducted to assess water availability and consumption in the Karkheh River Basin in Iran using secondary data and freely available satellite data. Precipitation was estimated using geo-statistical techniques while a Surface Energy Balance approach was selected for evapotranspiration estimation. The spatial distribution of actual evapotranspiration (ET a ) for the Karkheh Basin has been estimated by use of 19 cloud free Moderate Resolution Imaging Spectroradiometer (MODIS) images, which cover a complete cropping year from November 2002 to October 2003. ET a estimates were compared to potential crop evapotranspiration (ET p ) estimates for two predominantly irrigated wheat areas in Upper and Lower Karkheh. Differences were found to be 12.5% and 11.7% respectively. Results of the ETa and precipitation estimates reveal that for the study period, the Karkheh Basin received 18,507 × 10 6 m 3 as precipitation while ET a is estimated at 16,680 × 10 6 m 3 . Estimated outflow from the basin for the study period only is 7.8% of the precipitation and indicates that water is a very scarce resource in the Karkheh basin. The basin has been divided in sub-basins to allow for more detailed analysis and results indicate that water balance closure at sub-basin scale ranges from 7.2% to 0.6% of the precipitation. This suggests that the water balance is sufficiently understood for policy and decision making.

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Monin–Obukhov length as a cornerstone of the SEBAL calculations of evapotranspiration

Cited by 18 publications

References 13 publications

Surface Energy Balance of Fresh and Saline Waters: AquaSEBS

Surface Energy Balance of Fresh and Saline Waters: AquaSEBS

Using satellite remote sensing to assess evapotranspiration: Case study of the upper Ewaso Ng’iro North Basin, Kenya

Assessment of Water Availability and Consumption in the Karkheh River Basin, Iran—Using Remote Sensing and Geo-statistics

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