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<br />between these parts remains fixed for the study. The entire movable <br />bed part of the cross section is moved vertically up and down. Bed <br />forms are not simulated except that n-values can be functions of <br />discharge which indirectly permits a consideration of bed forms to <br />be made. Density currents and secondary currents are not accounted <br />for. <br /> <br />4. POTENTIAL APPLICATIONS OF THE PROGRAM <br /> <br />Reservoir deposition can be analyzed to determine both the volume <br />and location of sediment deposits. Degradation of the streambed <br />downstream from a dam can be determined. Long term trends of scour <br />or deposition in a stream channel, such as would result from modi- <br />fying frequency and duration of the water discharge or stage or <br />from encroaching on flood plains, can be simulated. Channel <br />contraction required to either maintain navigation depths or <br />diminish the volume of maintenance dredging can be studied--but <br />not in the detail obtainable from movable bed hydraulic model <br />studies. The influence that dredging has on the rate of deposition <br />can be simulated, and scour during floods can be investigated. <br />Sediment laden runoff through concrete channels can be analyzed <br />to determine if, where and how much deposition will occur. <br /> <br />Nature maintains a delicate balance between the water-sediment mixture <br />flowing in a natural stream, size and gradation of sediment material <br />forming the stream's boundary and hydraulics of flow. When man <br />establishes a reservoir or maintains a minimum depth of flow for <br />navigation, that balance is upset. This computer program can be <br />used to measure the impact of changing one or more of the above <br />parameters directly in terms of the water surface profile and <br />the water depth. <br /> <br />2 <br /> <br />~ '~~;'>-;,~",;~-< <br /> <br />,_." ____-__~~_,__L~~4.;;_~,~;..0.d.i""~~":;;;::;:;::....;,..;i,,i, ~:;'~-,~.f.:iL~ ."JiLI" .;"~,;~i'!fs;<',:""",;jj,.,_, <br /> <br />, <br /> <br />,,"".- <br /> <br />__;;'Ol-~~--_ <br /> <br />:,"-'_'~h_ <br />