02/07/2021 10:19 PM GMT+7 TP HCM
Polarimetric radar and cellphones signals as tools to analyse spatio-temporal variability of intense rainfalls at a fine scale
Presenter: Frédéric Cazenave, hydrometeorologist, research engineer at IRD (French National Research Institute for Sustainable Development), Grenoble, France
2 PM Friday, 2nd July, 2021
Rainfall is an essential element for the economic growth of countries and their populations. In south of Vietnam, driven by a monsoon regime, rainfall is mainly concentrated from May to October. Depending on their intensity and their spatial and temporal distribution, they can lead to the development of rain-fed agriculture, or lead to food, economic and human losses when they cause severe flooding. In the context of current and future climate change, the region is expected to be more frequently affected by extreme events.
In order to better understand the dynamics of intense precipitation and to anticipate its impacts, it is essential to observe and analyse its spatio-temporal variability at a fine scale. These observations can be carried out using a polarimetric radar which can correct the signal attenuation phenomena caused by precipitation and identifying the dominant hydrometeor types (liquid, solid or mixed) within an atmospheric volume in order to improve precipitation estimates. Rainfall variability can also be observed using mobile phone operator antenna networks. Indeed, rain disturbs the electromagnetic signals transmitted between the operator's masts. The knowledge of the signal attenuation, between 2 antennas, makes it possible to compute the average rainfall that caused the disturbance.
Real-time rainfall measurements can be fed into a rainfall-runoff model to generate early warnings of flooding, as tested in the RainCell app Bamako project in Mali. Perspective of application in Vietnam in Ho Chi Minh region will be discussed with participants.
On 22/10/2015, CARE has organized the meeting of the Scientific Council with the chairmanship of Dr. Nicolas Gratiot - Director and Chairman of the Scientific Council, Assoc. Pro. Vo Le Phu (on behalf of Assoc. Pro. Nguyen Phuoc Dan - Deputy Chairman)
Project description The availability of High Resolution Imagery (spatial, spectral, and radiometric) with an increased time revisit (Landsat-8 and now Sentinel-2) opens the way to a more detailed observation of coastal zones and inland waters (large rivers, lakes and reservoirs)
The pretty work, a monography collection of 15 megacities in the world about "Water, megacities and Global Change”, has been published by UNESCO. The CARE Lab-HCMUT Researchers are honored to represent Ho Chi Minh City by contributing an article
CARE Lab-HCMUT is pleased to present you our publication of the monography "Ho Chi Minh City growing with water-related challenges".
CARE Lab-HCMUT and PADDI, a member of the Ho Chi Minh City delegation, participated in the 26th Environment exhibition POLLUTEC, Lyon (France), which took place from 30/11 to 02/12/2016.