Method and device for simulating discharge, and computer device

A device for simulating discharge, comprising:

• an acquiring module configured to acquire the forcing data, wherein, the forcing data is configured to characterize climatic conditions of the river basin to be measured;
• and
• a simulating module configured to simulate the discharge of the river basin to be measured according to the forcing data and a calibrated hydrological model of the river basin to be measured, to obtain a simulated discharge of the river basin to be measured, wherein:
• the calibrated hydrological model is a model comprising calibrated model parameters;
• the calibrated model parameters are obtained by calibrating model parameters of an initial hydrological model, according to a converted discharge of the river basin to be measured and a GRACE-derived total water storage changes of the river basin to be measured;
• the converted discharge of the river basin is obtained by a remote sensing satellite, and the GRACE-derived total water storage changes of the river basin are obtained by a gravity satellite;
• and the converted discharge corresponds to a river width of the river basin to be measured;
• the GRACE-derived total water storage changes are anomaly series of monthly GRACE-derived total water storage measured in a preset time period, and acquiring the GRACE-derived total water storage changes of the river basin to be measured through a gravity satellite comprises:
• acquiring the monthly GRACE-derived total water storage of the river basin to be measured in the preset time period through the gravity satellite;
• obtaining an average monthly water storage in the preset time period from a sum of the monthly GRACE-derived total water storage;
• and
• calculating differences between the monthly GRACE-derived total water storage and the average monthly total water storage, to obtain an anomaly time series of the monthly GRACE-derived total water storage.