Joint project Spree Matter transformation in the Spreewald wetland region.

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Presentation transcript:

Joint project Spree Matter transformation in the Spreewald wetland region

Study site channel network with high density high groundwater table, 30% fens water consumptive area in summer time groundwater-table control (13 cascades) different flooding regimes during winter and summer seasons with partly flooding low flow velocities in channels v m = 0,01 m/s for MQ in the Upper Spreewald v m = 0,1 m/s for MQ in the Lower Spreewald

Water quality processes Q, cinput (e.g. Spree, Malxe) t, vHydraulic structures cccc pore water concentrations water column ± Q, c c ? area water exchange, loads matter concentrations of sediment

Conceptual model

Reduction of the network Modelled structure Scheme Complex model DUFLOW

Data acquisition, monitoring networks Hydrology, HydraulicsWater quality Discharges ( , monthly mean) Surface water quality ( , monthly, appointed date) Channel network, profilesGround water quality (near to surface) Water levels at weirs ( , monthly mean) Rate data (reaction kinetics) Ground water levels Sediment chemistry Distribution of substrates Pore water profiles Chemical composition of substrates

Simulation accuracy of transfer functions

Sink and source function for sulphate Sink and source function for sulphate Hydraulic calculations for different discharge scenarios: Summer- half year (SH) NW, MW, MHW, Winter- half year (WH) MW, HW Area loads : simulated by „ArcGRM Spreewald“ in dependence on time (month) and input discharge Algorithm for sulphate: C Spree = 1000 mg/l C Leibsch = 381 mg/l

SH_NWSH_MWSH_MHWWH_MWWH_HW Portion on sulphate load reduction by running water system ( sink ) % of input Load reduction by water consumption and flooding (infiltration, sink ) % of input Load addition by ground water (exfiltration, source ) % of output 00,134,50 Sulphate reduction by the Spreewald wetland region

Water quality modelling of the Spreewald wetland region at catchment scale needs model reductions Reduced model has to consider the main quality processes Special effect of wetlands is the load exchange with adjacent areas (in both directions) Governmental monitoring systems are not sufficient for data supply Summary

Confluence of Große Fließ and Mittelkanal Thank you