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<br />ei <br /> <br />The model utilizes the node concept, each node representing a <br />speC'iJic reach oi,triver. The node structure which the user sets up for <br />the 'model forms, ,the pattern for all other inputs and model cornputational <br />order. Computati.ons were made on a monthly time basis. <br />Four ,groups of inputs are required: Node structure; reservoir <br />operational data; demand data; and hydrology data. These are illustrated <br />on the block diagram. shown in Figure 1. <br />,,_ Desired output is written as the computations are made or written <br />on a lile and extracted aiter the run is complete depending on the options <br />specified at the beginning of the run. <br /> <br />Node Control Structure <br /> <br />The node control structure defined in the input data is design~d to <br />allow mathematical representation of a river basin. Node structure <br />refers to the sequence and arrangement of nodes within the basin to be <br />modeled. A specific reach of river is modeled by each node. The simu- <br />lation model presently has capability to handle 25 nodes. The node <br />structure currently set up lor the Colorado River is shown in Figure 2. <br />Each node is set up to compute flows and salinity at sequence <br />points in the node~ the values representing flows and salinities in the <br />river. This computation is made using inflows and outflows and their <br />respective salinities at these sequence' points. <br />A single node can include a maximum ~f 10 inflow points and 10 <br />demand points. A typical node is shown in Figure 3. A node can in- <br />clude one reservoir which requires one of the ten inflow points. Inflows <br />include such items as inflow from rim areas or intervening areas {rom <br /> <br />the hydrology data file~ main st.reamflow from an upstream node, or <br />return flow [rom a demand on the river. Demand points (outflow from <br />the node) include diversions from the river. Aa will be described under <br />IIDemand Input, .. a separate program is available to combine information <br />from up to 10 I'userall into the value lor one demand sequence point. <br /> <br />142 <br /> <br />~~. <br /> <br />. <br /> <br />tf5J'jr <br /> <br />. <br /> Demand <br />.-- Analysis of i- Node i-- Input <br />Historic Data Structure Data <br />r. P,oeram <br /> Synthetic , <br /> Hydrolon <br /> Generation <br /> Ploeram <br /> Reservoir Demand <br />L.. Hydrolon Operalional Data <br /> Data Base Data Base <br /> River Basin <br /> Simulation <br /> Model <br /> Output <br /> <br />Figure 1. River basin simulation model block diagram. <br /> <br />143 <br />