Heat Module benchmarks

This page describes benchmarks performed for the Heat Stress Module.

Heat Module

Tutorials

Overview

Theory

Benchmarks

The performed benchmark has an average difference below 0.70% 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 could be related to actual measurements made for the city of Wageningen. PET measurements for this exceptionally hot day are comparable to the daily PET measurements of 1-07-2015 for Wageningen.

Results

The PET Benchmark result overlays can be seen below:

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.

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:

Calculation time

The calculation time of the PET overlay of 1 timeframe on a 1x1 meter grid for a 4x4km area of Wageningen is +-16 seconds.

See also

• A tutorial on how to obtain and interpret dutch weather station data
• For a more in depth variance analysis, see analysis;