Catchment_Project_Philippines_Catchment_Data

Version:
November_2021

Data deposited:
15/11/2021

Contact: 
richard.boothroyd@glasgow.ac.uk; richard.williams@glasgow.ac.uk; plmtolentino@gmail.com



Overview:

Catchment properties were calculated using TopoToolbox V2 (Schwanghart & Scherler, 2014).

A nationwide digital elevation model (DEM) acquired in 2013 and generated through airborne Interferometric Synthetic Aperture Radar (IfSAR) was used for the analysis (Grafil and Castro, 2014).



Catchment attributes [units] (field names):

Catchment [-] (catchment) – name of catchment.

Area [km2] (c_area_km2) – the drainage area of the catchment.

Average elevation [m] (c_elev_m)  – the mean average elevation of the catchment.

Average slope [°] (c_slpe_deg) – the mean average slope in the catchment.

Hypsometric integral [-] (c_hi) – scalar value to describe the area distribution at different elevations.

Compactness [-] (c_compact) – the Gravelius compactness coefficient, a measure of catchment shape.

Maximum stream order [-] (s_max_sord) – the maximum Strahler stream order.

Total stream length [km] (s_tolen_km) – the combined length of streams in the catchment (1 km2 drainage area threshold).

Average stream length [km] (s_avlen_km) – the mean average length of streams in the catchment (1 km2 drainage area threshold).

Trunk stream length [km] (t_tolen_km) – the length of the longest stream in the catchment (1 km2 drainage area threshold).

Mean stream slope [m/m] (s_mn_slpe) – the mean gradient of the channel.

Median stream slope [m/m] (s_md_slpe) – the median gradient of the channel.

Drainage density [km/km2] (c_dd_kmkm2) – the total stream length divided by the catchment area.

Relief [m] (c_relief_m) – the difference between the minimum and maximum elevation in the catchment.



References:

Grafil, L. B., & Castro, O. T. (2014). Acquisition of IfSAR for the Production of Nationwide DEM and ORI for the Philippines under the Unified Mapping Project. Infomapper, 21, 12–13, 40–43. http://www.namria.gov.ph/jdownloads/Info_Mapper/21_im_2014.pdf
Schwanghart, W., & Scherler, D. (2014). Short Communication: TopoToolbox 2 - MATLAB-based software for topographic analysis and modeling in Earth surface sciences. Earth Surface Dynamics, 2(1), 1–7. https://doi.org/10.5194/esurf-2-1-2014