In: Journal of Hydrology and Hydromechanics, vol. 68, no. 4
H.i.g.s. Piyaruwan - P.k.s.c. Jayasinghe - D.a.l. Leelamanie
Detaily:
Rok, strany: 2020, 382 - 391
Jazyk: eng
Kľúčové slová:
Eucalyptus grandis; Groundwater modeling; Pinus caribaea; Water repellency; Water entry value.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Water repellency makes soils capable of resisting to the penetration of water applied on the surface and inflict
various influences on groundwater. The objectives of the present study were to identify the water repellency under pine
and eucalyptus plantations, to determine social impacts of water level changes, to find possible changes in groundwater
levels in the surrounding areas during the past four decades, and to relate water repellent characteristics of soils with the
groundwater level changes. The study was conducted in eucalyptus (Eucalyptus grandis) and pine (Pinus caribaea)
plantation forests located in Upcountry intermediate zone, Sri Lanka. Each land was separated into three blocks (B1, B2,
B3) based on the slope. Water repellency was measured with water drop penetration time (WDPT) and contact angle.
The water entry value was estimated with the pressure head method. Interconnected social impacts was examined using a
questionnaire based survey. Groundwater levels from 1980 to present were modeled with remotely sensed information.
Both eucalyptus and pine forest soils showed water repellency, which decreased with increasing soil depth. Eucalyptus
soils showed highly hydrophobic conditions on the surface (WDPT>7200 s). Ponding depths required for entry of water
into the soil in eucalyptus soils was 4.6–5.3 cm, whereas that of pine soils was 1.5–4.0 cm, although achieving these
levels would be difficult considering the steep slopes. Contact angle showed positive logarithmic correlation with water
entry value. The people living in the surrounding areas expressed less water availability for their domestic purposes,
decreased water level in household wells, and drying up of natural water resources at present compared with 1980s.
Modelling with remotely sensed thematic maps confirmed that the groundwater levels in both areas has decreased over
the time. It indicated that the eucalyptus and pine vegetation have created unfavorable conditions in regard with water
entry and groundwater recharge. Proper attention from the responsible authorities will be essential to prevent the adverse
impacts of on groundwater resources.
Ako citovať:
ISO 690:
Piyaruwan, H., Jayasinghe, P., Leelamanie, D. 2020. Water repellency in eucalyptus and pine plantation forest soils and its relation
to groundwater levels estimated with multi-temporal modeling. In Journal of Hydrology and Hydromechanics, vol. 68, no.4, pp. 382-391. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0030
APA:
Piyaruwan, H., Jayasinghe, P., Leelamanie, D. (2020). Water repellency in eucalyptus and pine plantation forest soils and its relation
to groundwater levels estimated with multi-temporal modeling. Journal of Hydrology and Hydromechanics, 68(4), 382-391. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0030
O vydaní:
Vydavateľ: VEDA, Publishing House of the Slovak Academy of Sciences, Bratislava, Slovakia
Publikované: 15. 12. 2020