Distributed unit line flood forecasting method
A flood forecasting, unit line technology, applied in forecasting, instrumentation, climate change adaptation, etc., can solve problems such as low forecast accuracy, low model fit, and complex parameters
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[0179] Such as figure 2 As shown, taking Jianshan in a certain area as the forecast station, the catchment area of the upstream basin of the exit section of Jianshan is 1570Km 2 , The river length is 91Km, there are 27 rainfall stations in total, and the ratio of this area is 0.0012. In this example, all 27 rainfall stations are used as sample rainfall stations. Therefore, the area of a single small watershed is:
[0180]
[0181] The river length of a single small basin is:
[0182]
[0183] The characteristic parameters of a single small watershed are:
[0184]
[0185] The characteristic parameters of the whole basin are:
[0186]
[0187] According to the characteristic parameter θ of a single small watershed Piece Calculate the rise time t P block :
[0188]
[0189] Among them, a=2.8×10 -6 , B=0.151, c=0.3; after calculation, we get t P block =3.54h;
[0190] Since the area of a single small watershed is 58.44Km 2 , By looking up the table, Δt=1h;
[0191] According to the ...
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