Actualités et séminaires

A river bankfull depth, one of the important topographic parameters in a river routing model, was estimated efficiently by using the model and a satellite altimetry dataset. we applied the method to the Amazon river basin, and, by a virtual test, confirmed that river bankfull depth would be improved even if the uncertainty of runoff existed.

Understanding complex reactions between CO2-rich water and rocks is fundamental for quantifying the carbon cycle. Earth’s CO2 degassing in hydrothermal fields integrates long-term consumption of the reactive surface area of the minerals involved in water rock interaction. We use the composition of CO2-rich geothermal waters to estimate the reacting surface area (RSA) of minerals in a granite, responsible for the gradient in pCO2 partial pressure observed in the field. The results show that the kinetic rates of mineral dissolution are not linear, as generally assumed.