Guilherme Sobrinho

8 Questions 10 Answers 0 Followers

Questions related from Guilherme Sobrinho

Dear fellows, what models are there available for water stable isotopes in the vadose zone?

I'm aware of Hydrus and Netpath, but are there others? I am highly interested in water stable isotopes in variably saturated and non-equilibrium flow (double porosity/permeability). Any hints...

22 October 2020 9,503 2 View

Dear fellows, how conceptual models for hard-rock fractured aquifers in (semi)arid environments represent "invisible" discharge besides RET?

How discharge is unsually conceptualized for catchments under arid or semiarid environments with no springs and only ephemeral rivers, in a context that could not be explained exclusively by...

28 May 2019 9,858 4 View

Dear fellows, do you know any methods for deriving discharge baseflow constants from groundwater level timeseries?

I am aware of many methods for estimating base-flow recession constants from discharge (due to spring outlets) hydrographs. Unfortunately, in my study case there is no discharge contributing to...

05 June 2018 1,557 3 View

What are the ratios between "readily available" and "fixed" phases of the soil exchangeable pool for poorly hydrated cations (e.g. Cs+, K+)?

I would like to know what are the average estimates for ratios between readily available (let's say accessible by a single extraction with NH4Ac, or AgTU, or BaCl, or KCl...), and "fixed" poorly...

01 February 2017 371 3 View

Dear fellows, Do you know any comprehensive and relevant, preferentially recent, reviews on the Rhizosphere?

I have only the basics on this topic from college. I would like to know what are the most comprehensive and most read reviews on this concept. Thanks in advance.

27 May 2015 2,260 4 View

Dear fellows, how can I express the concentration of a "metallorganic" ionic complex in terms of cmolc.L^-1?

I'd like to express the concentration of silver thiourea in aqueous solution [Ag(TU)n]+1 in terms of cmolc.L-1. The protocols for soil CTC using AgTU consider the mass of Ag for calculations and...

28 April 2015 1,181 4 View

Are there any computational codes or models for soil pollutants that use parameters other than linear Kd?

The most widely used parameter for biogeochemical modelling of radionuclides in soils is arguably the Kd. The use of some sort of Kd (e.g. kinetic, parameterized, one-point-Kd) is only possible...

05 November 2014 2,072 1 View

Does any of you know about methods for evaluating the predictive and/or the descriptive power of mathematical models (e.g. sorption isotherms)?

With special concern to multimodel selection, linear regression and theoretic-informational approaches (e.g. AICc).

07 May 2014 883 2 View