ABSTRACT

Catchments with response time shorter than a day require simulations at sub-daily resolution for flood forecasting. Long-term hydrological data with sub-daily time resolution is lacking for many catchments and, thus, it is worthwhile to investigate the potential in using hydrological model parameters calibrated at a daily temporal resolution to simulate sub-daily runoff. This study investigates the potential of directly transferring the parameters from the one-day Hydrological Predictions for the Environment (HYPE) model for Sweden to a one-hour time step version. A sensitivity analysis and calibration of the one-hour model were also performed to explore the possibility of achieving improved model performance through an additive and multiplicative scaling of the parameters. Directly transferring the parameters led to a negligible loss in performance for all 147 catchments evaluated here. Scaling of the parameters did not lead to improvement for slow-responding catchments, while the increase in performance was negligible for catchments with sub-daily response time.

摘要

响应时间短于一天的流域需要以次日分辨率进行模拟以进行洪水预报。许多流域缺乏具有次日时间分辨率的长期水文数据，因此，值得研究使用以日时间分辨率校准的水文模型参数来模拟次日径流的潜力。本研究调查了将参数从瑞典的一日环境水文预测 (HYPE) 模型直接转换为一小时时间步长版本的潜力。还对一小时模型进行了敏感性分析和校准，以探索通过参数的加法和乘法缩放来提高模型性能的可能性。直接传递参数导致此处评估的所有 147 个流域的性能损失可以忽略不计。参数的缩放并没有导致响应缓慢的流域的改进，而对于具有次日响应时间的流域，性能的提高可以忽略不计。