Regional modelling of the Narayani basin in Nepal.

Abstract

Computing inflow from ungauged basins is a challenge in practical hydrology since many

planning assignments is located in areas where no data is available. A number of methods

are developed to handle ungauged basins with variable success. One method that could be

useful is regional calibration of hydrological models where the idea is that a parameter set

for model simultaneously calibrated for several catchments will be valid also for other

catchments in the same region. The purpose of this MSc thesis is to investigate this for the

Narayani basin in Nepal. The main topics of the work will be the following:

1. Prepare climate, runoff and catchment data for the Narayani basin for use in the

SHyFT hydrological model. It should be paid particularly attention to runoff data for

calibration and evaluation of the model.

2. Set up and calibrate the model for the Narayani region.

3. Study strategies for regionalization of the parameter set and evaluate it´s goodness

and uncertainty.

4. Test the model for a number of catchments not included in the calibration on the

ability to predict the duration curve, time series of flow and extremes.