This unique addition to reference literature provides an introduction to the major concepts and contemporary issues that are essential for students of environmental science and environmental studies to know. With over 200 entries authored by world-class names like Anthony Brazel, John Day and Edward Keller, this text is divided into six sections: Environmental Science, Environments, Paradigms & Concepts, Processes & Dynamics, Scales & Techniques, and Environmental Issues.  

River Systems

River systems

The system of rivers and stream channels in a drainage basin that make up the drainage network. The drainage network is a fundamental element of terrestrial landscapes because it acts as the artery along which water and sediment is transported and hence is critical to environmental processes. In semi-arid areas channels may be ephemeral and seldom contain flowing water. Elements in the drainage network of a river system have been denoted by systems of stream ordering in which the outermost unbranched tributaries are designated order 1 and in the most usually used system two first order streams combine to produce a second order, two second order streams will produce a third order and so on. Such ordering systems (Fig. 53) do not ...

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