Heat module benchmarks

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This page describes benchmarks performed for the Heat Stress Module.



The performed benchmark has an average difference below 0.68% for the selected measurement points.

Introduction

This benchmark case is situated on 02-08-2013 and is included in the DPRA Heat stress report. It is deemed relevant to the report because it can be related to actual measurements made for the city of Wageningen. The PET measurements for this exceptionally hot day are comparable to the default 01-07-2015 reference case for Wageningen.

Results

The PET Benchmark result overlays can be seen below:

Pet 2 augustus 2013 12 utc herwijnen.png Pet 2 augustus 2013 12 utc tygron.pngPet legend.png

Point Measurement Analysis

Several points have been compared for results. These points across the map have been selected based on fact that their spatial situation (i.e. input data like foliage and vegetation fraction) is similar for both the Wageningen calculated PET and Tygron generated PET.

Wageningen 2013 08 02 measurementpoints.png
id Wageningen PET Tygron PET Difference (%)
01 46.12 46.13 0.022
02 47.44 48.04 1.26
03 47.11 47.52 0.87
04 44.70 44.99 0.65
05 40.53 40.48 -0.12
06 38.69 38.67 -0.05
07 42.52 42.45 -0.16
08 44.87 44.03 -1.87
09 43.62 43.02 -1.38
10 46.79 46.58 -0.45
11 38.70 38.79 0.23
12 44.40 44.00 -0.90
13 46.34 46.29 -0.11
14 45.58 45.77 0.42
15 39.05 39.42 0.95
16 38.22 38.28 0.16
17 43.23 43.88 1.50
18 46.34 46.49 0.32
19 45.59 44.84 -1.65
20 46.21 45.96 -0.54
Average 0.68

So on average for points that in both cases have a similar spatial situation the difference in calculated PET is 0.68%.

Setup

Weather data from weatherstation Herwijnen has been used for this test case. The used values are:

Variable Value
Date 02-08-2013
Hour of day 14
Sun altitude 55.5
Sun azimuth 186.9
Sun daily motion factor 0.063
Humidity (%) 56
Sun radiation (W/m2) 774
Temperature (°C) 31.7
Wind speed (m/s) 4
Wind direction (°) 140
Daily min. temperature (°C) 18.9
Daily max. temperature (°C) 34.1
Daily avg. radiation (W/m2) 455
Daily avg. wind speed 3.17

The foliage height will be defined by a Geotiff. See the images (overview and zoomed in east-south-east corner) below:

Foliage heights wageningen.png Foliage heights wageningen zoomed.png Foliage legend.png

Calculation time

The calculation time of the PET overlay of 1 timeframe on a 1x1 meter grid for a 4x4km area of Wageningen is approximately 5 seconds.

See also