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<br />LESSON 2 <br /> <br />STREAM STABILITY - GEOMORPHIC FACTORS AND PRINCIPLES <br /> <br />I. FLUVIAL. CYCLES AND PROCESSES <br /> <br />A. Geomorphology is the science that deals with the relief features of the <br />earth's surface. Fluvial systems are those systems related to streams or <br />rivers, Therefore, fluvial geomorphology is the science dElaling with the <br />profiles and planforms of streams and rivers, <br /> <br />B. Rivers are dynamic, always changing their position, shape and other <br />morphological characteristics with variation in discharge and the passage <br />of time. <br /> <br />C. When a channel at or nl~ar a bridge is modified, this local change <br />frequently causes modification of channel characteristics both up.. and <br />downstream. Conversely, channel modifications above or below the brk:lge <br />reach can affect channel characteristics in the bridge f1~ach. <br /> <br />NOTES: <br /> <br />2,1 <br />