Joint Effects of the DEM Resolution and the Computational Cell Size on the Routing Methods in Hydrological Modelling

Natural disasters, including droughts and floods, have caused huge losses to mankind. Hydrological modelling is an indispensable tool for obtaining a better understanding of hydrological processes. The DEM-based routing methods, which are widely used in the distributed models, sensitive both DEM resolution computational cell size. Too little work has been devoted joint effects size on methods. This study aims those two factors discharge simulation performance with representative selected methods improved aggregated network-response function method (I-NRF) Liner-reservoir-routing (LRR). Those combined runoff generation models simulate discharge. evaluated under cross combination four resolutions (i.e., 90 m, 250 500 1000 m) fifty-six sizes (ranging from 5 arc-min 60 arc-min). Eleven years hydroclimatic data Jianxi basin (2000–2010) Shizhenjie (1983–1993) China used. results show that different I-NRF LRR method. nearly no influence while does. On contrary, decreases oscillating values as increases, but hardly affected by resolution. Furthermore, can be ignored this will help establish appropriate resolution, size, when researchers build predict future disasters.