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<br />1128 <br /> <br />T, C, GRAND ET AL <br /> <br />(n) <br /> <br /> <br />~' ~ " 2,P 'P <br />(I 5 10 15m <br />t 1 l I <br /> <br /> <br />(b) <br /> <br />l\ltd;j,j,=~:=:=S;=! <br /> <br />Figure 2, Photograph and topographic map of backwater 6 <br /> <br />Physical habitat nwdel <br /> <br />We used a grid of square cells (each 1 m2) t.o represent backwat.er topography. TIle shape and topography of a <br />backwater, cell depths over ti me and the movement: of water intD and out of the backwater were all determined from <br />two inputs: the ceU coordinates (x. y and z or bed elevation; measured in m and assumed to be fixed over the time <br />period modelled) and hourly mainstem flow (measured in m3. S-I). The cell input also included a variable that <br />identified whether each cell was in the backwater or the mainstem, (The boundary between the backwater and the <br />mainstem was determined by estimating where still water and flm,ving water conditions prevail, and were based on <br />field observations,) The model then determined which backwater cells were connected to the mainstem, by <br />det.ennining whether any adjacent neighbour was a mainstem celL <br /> <br />Copyright 1::" 2006 John Wiley & Sons, Ltd, <br /> <br />River Res, Applic, 22: 1]25-1142 (2006) <br />DOl: lO,lO02/rra <br />