One important reason the LoHy+ is proposed is to reduce the computation cost of the HFM. The computer used for simulations in this study has an 8-core CPU (Intel Xeon E-2288G CPU), a GPU (Nvidia Quadro RTX 5000) and 64GB RAM. The computational time used for simulating the validation event using both methods are compared in Table 1. It can be seen from the table that the proposed method only takes around 16% of the time used by the HFM. The LoHy+ method is approximately five times faster than the original HFM.
Time cost for 2010–2011 historical flood simulation of low-fidelity and high-fidelity hydrodynamic models
| Models . | Flood period simulated . | Time consumed in simulation (day) . | Fraction of the time compared to HFM (%) . |
|---|---|---|---|
| HFM | 17/05/2010–17/05/2011 | 19.3 | N/A |
| LoHy + | 17/05/2010–17/05/2011 | 3.08 | 16 |
| Models . | Flood period simulated . | Time consumed in simulation (day) . | Fraction of the time compared to HFM (%) . |
|---|---|---|---|
| HFM | 17/05/2010–17/05/2011 | 19.3 | N/A |
| LoHy + | 17/05/2010–17/05/2011 | 3.08 | 16 |