### Abstract

A method to estimate areal evaporation using a microwave link (radio wave scintillometer) in combination with an energy budget constraint is proposed. This radio wave scintillometry-energy budget method (RWS-EBM) is evaluated for its applicability in different meteorological conditions and for its sensitivity to various variables (the structure parameter of the refractive index of air C n 2, the total available energy R n - G, the wind velocity u, the effective average vegetation height h 0, and the correlation coefficient between the temperature and humidity fluctuations r TQ ). The method is shown to be best suited for use in wet to moderately dry conditions, where the latent heat flux is at least a third of the total available energy (i.e., Bowen ratio =2). It is important to accurately measure the total available energy and the wind velocity as the RWS-EBM is most sensitive to these variables. The Flevoland field experiment has provided the data, obtained with a 27-GHz radio wave scintillometer (over 2.2 km), a large-aperture scintillometer (also 2.2 km), and four eddy covariance systems, which are used to test the RWS-EBM. Comparing 92 daytime measurements (30-min intervals) of the evaporation estimated using the RWS-EBM to that determined in alternative manners (eddy covariance and two-wavelength scintillometry) leads to the conclusion that the method provides consistent estimates (coefficient of determination r 2 = 0.85 in both cases) under relatively wet conditions.

Original language | English |
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Article number | W04416 |

Number of pages | 9 |

Journal | Water Resources Research |

Volume | 43 |

DOIs | |

Publication status | Published - 2007 |

### Keywords

- flevoland field experiment
- sensible heat fluxes
- heterogeneous surface
- refractive-index
- large-aperture
- scintillometers
- fluctuations
- absorption
- momentum
- basin

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## Cite this

Leijnse, H., Uijlenhoet, R., & Stricker, J. N. M. (2007). Hydrometeorological application of a microwave link: 1. Evaporation.

*Water Resources Research*,*43*, [W04416]. https://doi.org/10.1029/2006WR004988