Prokos et al

EVAPOTRANSPIRATION

ESTIMATION AND ITS EFFECT ON

THE WATER BUDGET OF AN

OXBOW AND ITS RIPARIAN FORESTPROKOS, H. - DEZSŐ, J. – HALÁSZ, A. – TÓTH, G. – LÓCZY, D.

INSTITUTE OF GEOGRAPHY, FACULTY OF SCIENCES,

UNIVERSITY OF PÉCS,

PÉCS, HU

Photo: Prokos, H. 2015

Source: www.osdrava.hu

Source: Dezső et al. 2015

MAIN PROBLEMS

➢ Determine the amount of water needed, via

➢ETP (tree species, age, canopy closure, etc)

➢Groundwater flow

➢Different governmental purposes regarding the water

management (drainage – retention)

METHODS

NEBIH (Hungarian Forest Management-

online database)

ETI – Pécs (Institute for Forest Science – Pécs)

Scientific papers (related ETP)

fieldwork

Photos: Dezső, J. 2015

Online map – Hungarian Forestry Institute; the Cún-Szaporca studied area

GROUNDWATER – HYDROLOGIC SYSTEMS

Dezső, J. 2015

CALCULATIONS - ESTIMATIONSTree species % ha m2 ETP (average) m3 ETP/year

poplar 35.00 42.00

10000 710 298200

willow25.00

30.0010000 750 225000

black locust 23.00 27.60 10000 279 77004

maple 13.00 15.60 10000

sessile oak 2.00 2.40 10000 441 10584

elm 2.00 2.40 10000

100.00 120.00 610788.000 m3 ETP/120ha/170day

3592.871 m3 ETP/120ha/day

29.941 m3 ETP/ha/day

0.347 liter/sec/ha

20.792 liter/min/ha

2495.049 liter/min/120ha

Tree species composition and the spatial distribution of forestry area in the Cún-Szaporca

oxbow-area

ECOLOGICAL FLOW – ENVIRONMENTAL

As planned – ~10 000 ha → 300 000 m3 water

30 m3/ha/ day, else 3592 m3/current area/vegetation period

Water-need supplied by groundwater

Decreasing groundwater decreasing water level

Sensitivity to drought (warm – moderate dry / moderate warm – moderate dry)

WATER SCARCITYPhoto: Prokos, H. 2015

CONCLUSIONS

❖Planned forestry works → ← Planned water level

❖Area is endangered by drought – extra water demand, even for current stands

❖Studied area is under protection of „Ramsar 2000” → must be maintained by stakeholders

❖opposite intentions regarding water management → one must take into account the extra water-quantity needed to maintain environmental flows and forestry areas when planning

THANK YOU FOR YOUR ATTENTION

Photo: Dezső, J. 2015

Prokos et al

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