Environmental Engineering Reference
In-Depth Information
certain amount of redundancy within the system has been reported. However,
there are many other types of function within systems that should be investi-
gated together with the identification of thresholds of redundancy.
Although the presence of metals in their dissolved form within waters has
traditionally been seen as the most significant threat to organisms (particularly
macroinvertebrates), it is becoming clear that the presence of metals associated
with sediments constitute an equivalent (if not more important) threat. The
longevity of such deposits and their reactivity to changing environmental
conditions makes them a particularly important source of metal contamin-
ation to be considered for the future. It is vital, therefore, that the pathways by
which the metals are transferred to organisms and the responses of sediment
chemistry to changes in flow conditions and flooding amongst other environ-
mental variables are identified in order to provide data for sediment quality
guidelines for environmental organisations and enforcers.
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