Soil moisture conditions and air temperatures - literature needed I am looking at basics academic papers which tell about the physical floods mechanisms. 

In particular something that says that: 'lower temperatures reduce evapotranspiration, enhancing wet soil conditions which reduce the soil infiltration promoting water runoff and eventually fluvial peak flows'.

Do you know anything about this?
If you're after "basic" academic work, I suggest the following 2003 textbook from the Utah State University entitled, "Rainfall Runoff Processes", chapter 2:

Runoff Generation Mechanisms

It looks like a pretty good compendium of what you're looking for with easy-to-understand text and clear diagrams. Further detail, if needed, can be found by hunting down the references within. The entire textbook can be downloaded here:

Rainfall Runoff Processes