An important part of the risk management of natural hazards in
mountain regions concerns the hazard assessment and the planning of
protection measures in steep headwater catchments, i.e. torrent
control and slope stabilization. Torrent processes in steep
channels have their rightful place among the various alpine natural
hazards and the corresponding control measures have a long
tradition in the European alpine countries. In the planning and
execution of such measures, professional experience has been of
paramount importance. This experience was based primarily on
observations made during and after hazardous events, as well as on
regular field visits in the catchments of a steep headwater stream.
Quantitative measurements, e.g. of the discharge and of the eroded
and deposited solid materials, have been increasingly carried out
only in the last decades. This set the basis to develop and improve
quantitative methods to predict flow hydraulics, bedload transport
and debris flows in torrent catchments. This publication presents
an overview of methods to quantify channel processes in steep
catchments. The understanding and the quantitative description of
channel processes provides an essential basis for the planning of
protection measures.
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