Conference presentation

1. EVAPOTRANSPIRATION
ESTIMATION AND ITS EFFECT ON
THE WATER BUDGET OF AN
OXBOW AND ITS RIPARIAN FOREST
PROKOS, H. - DEZSŐ, J. – HALÁSZ, A. – TÓTH, G. – LÓCZY, D.
INSTITUTE OF GEOGRAPHY, FACULTY OF SCIENCES,
UNIVERSITY OF PÉCS,
PÉCS, HU
Photo: Prokos, H. 2015

2. Source: www.osdrava.hu
Source: Dezső et al. 2015

3. 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)

4. METHODS
NEBIH (Hungarian Forest Management-
online database)
ETI – Pécs (Institute for Forest Science – Pécs)
Scientific papers (related ETP)
fieldwork
Photos: Dezső, J. 2015

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

6. GROUNDWATER – HYDROLOGIC SYSTEMS
Dezső, J. 2015

7. CALCULATIONS - ESTIMATIONS
Tree species % ha m2 ETP (average) m3 ETP/year
poplar 35.00 42.00
10000
10000 710 298200
10000
willow
25.00
30.00
10000 750 225000
10000
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

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

9. ECOLOGICAL FLOW – ENVIRONMENTAL
FLOW
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 SCARCITY
Photo: Prokos, H. 2015

10. 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

11. THANK YOU FOR YOUR ATTENTION
Photo: Dezső, J. 2015