Comparison of surface foil materials and dew collectors location in an arid area: a one-year field experiment in Kenya

Juuso Tuure (Corresponding Author), Antti Korpela, Mikko Hautala, Mikko Hakojärvi, Hannu Mikkola, Matti Räsänen, Jonathan Duplissy, Petri Pellikka, Tuukka Petäjä, Markku Kulmala, Laura Alakukku

    Research output: Contribution to journalArticleScientificpeer-review

    13 Citations (Scopus)

    Abstract

    This study characterized different polyethylene (PE) and polyvinyl chloride (PVC) plastic foil materials effectiveness for dew collection in arid field-conditions in Kenya. Dew yields were collected daily for one year. Ten dew collectors with four different plastic foils were setup in the experimental field. The cumulated dew yields ranged from 18.9 to 25.3 mm. The greatest cumulated dew yields were 25.3 mm (nightly mean 0.096 mm) and 24.3 mm (nightly mean 0.093) measured with PVC and OPUR coated collectors respectively. The lowest cumulated dew yields 18.9 mm (nightly mean 0.075 mm) and 19.1 mm (nightly mean 0.074 mm) were measured with PVC and PE coated collectors respectively. Dew provided a continuous water source during the dry season. The type of the surface material was not found to be a determining factor for the collected dew yield. The location of the collector at the experimental field had impact on the collected dew yields. We also compared harvested dew yields to measured meteorological parameters and calculated dew yields with the use of a diffusion model using the measured surface temperatures and coefficient of mass diffusion to evaluate the dew collecting potential under the prevailing conditions.
    Original languageEnglish
    Article number107613
    JournalAgricultural and Forest Meteorology
    Volume276-277
    DOIs
    Publication statusPublished - 13 Jun 2019
    MoE publication typeA1 Journal article-refereed

    Funding

    Funding from the of Academy of Finland is gratefully acknowledged for TAITAWATER (Integrated land cover-climate-ecosystem process study for water management in East African highlands) and DF-TRAP (Development of cost-effective fog and dew collectors for water management in semiarid and arid regions of developing countries, project No. 257382), and as well as MVTT foundation (Maa- ja vesitekniikan tuki ry). CHIESA project funded by Ministry for Foreign Affairs of Finland is acknowledged for the reference weather station. Mwadime Mjomba and Jenipher Nyambura are gratefully acknowledged for maintaining the experimental field. Research permit NCST/RCD/17/012/33 for TAITAWATER from National Council for Science and Technology of Kenya is greatly acknowledged, as well as logistical support from Taita Research Station of the University of Helsinki.

    Keywords

    • Dew
    • Drought
    • Dryland
    • Water harvesting

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