Water Resource Associates

TRMM-sys

Over the past three years, WRA has been actively using TRMM data for water resource and flood defence projects, particularly in areas of sparse data. David Plinston is leading this initiative and has further enhanced the TRMM-sys software and database configuration to provide continuous rainfall time-series and rainfall intensity-duration-frequency [IDF] curves for any point on the globe between the 50 degree latitudes. The software analyses TRMM rainfall by quarter degree grid cell for any duration between 3 and 72 hours for the 1998-2014 period, a record of 192 months of short-duration rainfall data.

This global database and software system can provide a rapid response to project requirements anywhere in the Earth’s tropical and sub-tropical regions. An IDF relationship can be derived or specific storm events can be investigated for any location with relative ease.

So far, the data have been used and tested by WRA in Brunei, Sarawak, Indonesia, Yemen and Angola. The data have been validated by comparison of statistics with ground stations, and the software is undergoing further development.
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Comparison of Monthly Rainfall and CV at Two sites
TRMM data were acquired as part of the activities of NASA's Science Mission Directorate, and are archived and distributed by the Goddard Earth Sciences Data and Information Services Center
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TRMM Grid cells across a large river basin
The Tropical Rainfall Measuring Mission (TRMM) is a joint NASA-JAXA [Japanese] satellite mission to monitor tropical and subtropical precipitation and to estimate its associated latent heating. TRMM was launched in November 1997, and provides Real-Time Multi-Satellite Precipitation Analysis.

TRMM data represent an areal rainfall averaged across the grid cell, as opposed to a point-rainfall, measured at a rainfall station. The areal measure of rainfall in each cell varies with latitude, and grid-cells are 28 by 28 km at the equator, which represent an area of 784 km2. [http://pmm.nasa.gov/node/158]
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Distribution of TRMM rainfall across a river basin in four different rainfall events
TRMM data were acquired as part of the activities of NASA's Science Mission Directorate, and are archived and distributed by the Goddard Earth Sciences Data and Information Services Centre.


TRMMsys - Current program segments
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Nomenclature

Blocks: Rectangular arrays of TRMM cells (current limiting size 40 x40 cells)
Locations: Individual cells eg raingauge locations (current limit 10 locations)
Sub-basins: Defined by array from GIS intersection of sub-basins with TRMM cells (current limit 10 sub-basins)
GRID: Ascii GRID files
TXT: Text file
IDF: Intensity-Duration-Frequency
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