EGU21-12780, updated on 31 May 2021
https://doi.org/10.5194/egusphere-egu21-12780
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Monitoring of an irrigated olive orchard using C-band backscattering coefficient and interferometric coherence at high temporal frequency: preliminary results

Adnane Chakir1, pierre-louis frison2, Said khabba1,3, jamal ezzahar3,4, ludovic villard5, nadia ouaadi1,5, valerie ledantec5, pascal fanise5, and lionel jarlan5
Adnane Chakir et al.
  • 1LMME, Department of Physics, Faculty of Science Semlalia, Cadi Ayyad University, Marrakech, Morocco
  • 2LaSTIG, UPEM / IGN, Champs sur Marne, Paris, France.
  • 3CRSA, Centre for Remote Sensing Applications, Mohammed VI Polytechnic University (UM6P), Ben Guerir, Morocco
  • 4MISCOM, National School of Applied Sciences, Cadi Ayyad University, Safi, Morocco
  • 5CESBIO, University of Toulouse, IRD/CNRS/UPS/CNES, Toulouse, France.

In the south Mediterranean region already facing water scarcity, up to 80% of available water is used by irrigated agriculture. This work focuses on the analysis of the C-band response of a tree crop with in situ data acquired with a time step of 15 mns in the final objective of developing water stress detection approaches based on radar data. Focus is put on the daily cycle of the radar-backscattering coefficient and of the interferometric coherence. The site is located in the Chichaoua region (Morocco) was equipped in May 2019 with 6 C-band radar antennas installed on a 20 m tower. In parallel, automatic acquisitions at a half hourly time step of latent and sensible heat fluxes, sapflow, soil moisture and temperature profile together with manual  measurements of LAI, soil roughness and above ground biomass every 15 days were carried out. The preliminary results show a strong daily cycle of the interferometric coherence with a significant drop of the coherence during daytime. The coherence loss at dawn occurred concurrently with the start of the sapflow while minimum values were observed in the afternoon when wind speed is maximum. A significant daily cycle of the backscattering coefficient is also prominent. The amplitude of the daily cycle decreased from the dormancy period in winter from up to 2dB to less than 1dB in summer when physiologic activity of the trees is at its maximum. These first results open perspectives for the monitoring of the hydric status of crops within the frame of future radar missions in geostationary orbit.

How to cite: Chakir, A., frison, P., khabba, S., ezzahar, J., villard, L., ouaadi, N., ledantec, V., fanise, P., and jarlan, L.: Monitoring of an irrigated olive orchard using C-band backscattering coefficient and interferometric coherence at high temporal frequency: preliminary results, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12780, https://doi.org/10.5194/egusphere-egu21-12780, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.