| Title: | Hydro-meteorological assessment of three GPM satellite precipitation products in the Kelantan river basin, Malaysia |
| Authors: | Tan, M.L., N. Samat, N.W. Chan and R. Roy |
| Year: | 2018 |
| Journal: | Remote Sensing |
| Volume (Issue): | 10(7) |
| Pages: | |
| Article ID: | 1011 |
| DOI: | 10.3390/rs10071011 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | climate data effects |
| Secondary Application Category: | hydrologic assessment |
| Watershed Description: | 12,134 km^2 Kelantan river, which drains about 85% of the state of Kelantan in north central peninsula Malaysia. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The rapid development of Satellite Precipitation Products (SPPs) has heightened the
need for a hydro-meteorological assessment of the Integrated Multi-satellite Retrievals for Global
Precipitation Measurement (IMERG) products in different climate and geographical regions.
Reliability of the IMERG early (IMERG_E), late (IMERG_L) and final (IMERG_F) run products in
precipitation estimations was evaluated over the Kelantan River Basin, Malaysia from 12 March 2014
to 31 December 2016. The three IMERG products were then incorporated into a calibrated Soil and
Water Assessment Tool (SWAT) model to assess their reliability in streamflow simulations. Overall,
monthly precipitation variability is well captured by the three SPPs. The IMERG_F exhibited a
smaller systematic bias (RB = 7.14%) compared to the IMERG_E (RB = -10.42%) and IMERG_L
(RB = -17.92%) in daily precipitation measurement. All the three SPPs (NSE = 0.66~0.71 and
R2 = 0.73~0.75) performed comparably well as precipitation gauges (NSE = 0.74 and R2 = 0.79)
in the daily streamflow simulation. However, the IMERG_E and IMERG_L showed a significant
underestimation of daily streamflow by 27.6% and 36.3%, respectively. The IMERG_E and IMERG_F
performed satisfactory in streamflow simulation during the 2014–2015 flood period, with NSE and R2
values of 0.5~0.51 and 0.62~0.65, respectively. With a better peak flow capture ability, the IMERG_F
outperformed the near real-time products in cumulative streamflow measurement. The study has
also shown that the point-to-pixel or pixel-to-pixel comparison schemes gave comparable conclusions.
Future work should focus on the development of a standardized GPM hydro-meteorological
assessment framework, so that a fair comparison among IMERG validation studies can be conducted. |
| Language: | English |
| Keywords: | GPM; IMERG; SWAT; Kelantan; Malaysia; precipitation; streamflow; hydrology; meteorology; satellite precipitation product |