Could you be a little more specific? Do you mean to identify main geomorphological features? and do you want to establish its relationship to the hydrogeology of the area, or you want to use them for modelling? what is it actually that you want to do?

yes Rafael

To identify main geomorphological features and do you want to establish its relationship to the hydrogeology of the area.

Geomorphology is control the hydrogeology. choose and low lying with sediment with metamorphic region is suitable for building blocks site.

Hello Antony

I did not understand their placement. Could you clarify?

My research area presents: crystalline basement rocks, intracratonic basin sediments and volcanic rocks, stacked in that order (in the layers hidrogeology).

First classify rock types along with the elevation. Groundwater movement and hydrology is depends upon the elevatioon. Just one example In world groundwater quantity flow depend upon elevation. Note in your local well and water level compare with depth of water level and elevation.

In a very simplified way, one could say that a given gemorphological unit is mainly characterized through its lithology and topography, were slope may be taken as a surrogate for topography.  

Having this said, you have to carry out a traditional geomorphological analysis based on air fotos or satellite image interpretation, geological maps and topographic maps to identify geomorphological units. Some GIS programms (IDRISI, SAGA) have tools that help on the identification of geomorphological features. How to do this? Well it would be long to write down here.

Its relationship to the hydrogeology can not be established straight away, but you could start with a broad classification where flat areas, with porous materials are good recharge areas and steep areas with impermeable materials are bad recharge areas.

You can then start to make this broad classification more objective by looking out conductivity parameters for similar conditions or if you are lucky there may be some of this information for your study area. 

From this point on, it depends on your final goals, what you can do with this information and what additional information you may require. 

This is a very broad, undetailed answer, but hope it helps.

Thanks Rafael for the excellent response.

I will try INSTALLING SAGA in my QGIS and check for these geomorphology modules. There would be in GRASS something similar?

About the purpose of my research is to define large polygons from geomorphological guidelines (based on the slope) and check the waste of failures and their potential for disconnection of aquifers (whith suport controls wells and lineaments (interpreted in shaded relief map).

If there are any other tips and material for this research are always welcome.

best regards