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在水文水动力学中，为了便于解算方程，会引入单宽流量概念
单位宽度的通量在代码中乘以边界段的长度（对于边界通量）或单元格大小（对于点源），以得到m^3/s中的质量通量。
Where Valuei is the value of the relevant quantity for the given boundary type. For all HVAR boundaries Valuei is a water surface elevation in metres. However, the units of Valuei for QVAR boundaries depend on whether the given boundary identifier is specified in the .river or .bci files. This seems complex, but is a consequence of having a 1D channel model coupled to a 2D floodplain model and actually makes setting up the code a lot easier. For a QVAR boundary specified in the .river file Valuei is given as mass flux with units of m3s-1. By contrast, for a QVAR boundary specified in the .bci file Valuei is given as mass flux per unit width with units of m2s-1. In this latter case the flux per unit width is multiplied within the code either
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