Tereno Advisory Board Meeting Sept. 2001 Excursion: Rappbode Reservoir
Karsten Rinke Department of Lake Research Page 2 The Rappbode Reservoir Observatory
located at Rappbode reservoir (Harz Mountains, Germany) Investment: about 500.000 € Countinuous monitoring of nutrient and carbon fluxes and corresponding ecosystem dynamics
Rappbode Reservoir One main reservoir and 3 pre-dams Drinking water supply for over 1 Mio people Surface area: 395 ha Volume: 113 Mio m3 Max. depth: 89 m mesotrophic
Photo: André Künzelmann (UFZ)
Page 3 The Rappbode Reservoir Observatory main reservoir three pre-dams 4 inflow stations Real-time & continuous measurement of - temperature - conductivity - turbidity -nitrate -DOC and event-dependent water sampling by automated water samplers Talsperrenbetrieb Sachsen-Anhalt
Page 4 The Rappbode Reservoir Observatory
3 connecting stations Real-time & continuous measurement of - temperature - conductivity - turbidity -nitrate -DOC - oxygen - chlorophyll
Talsperrenbetrieb Sachsen-Anhalt
Page 5 The Rappbode Reservoir Observatory
1 offshore station Meteorological buoy (wind, temperature, humidity, radiation) Real-time & continuous measurement of - temperature - conductivity - turbidity -nitrate -DOC - oxygen - chlorophyll Talsperrenbetrieb Sachsen-Anhalt
Page 6 Example: Warme Bode 10-22. Sept. 2011
70 water level water temperature 190 SAC254 conductivity 60 170 50 150 40 130
30 110
20 90
10 70
0 50 8.9.11 10.9.11 12.9.11 14.9.11 16.9.11 18.9.11 20.9.11 22.9.11 24.9.11 0:00 0:00 0:00 0:00 0:00 0:00 0:00 0:00 0:00
Page 7 Nutrient elimination in pre-dams
CO2 CO2
CO 2 SRP DOC DOC POC SRP PP ALGAE PP POC CO2
Phosphorous (P) water level in the the pre-dam Carbon (C) water level in the main dam Sedimentation Page 8 DOC = Dissolved organic carbon
Poolgrößen DOC Ozean 700 Gt
CO2 Atmosphäre 750 Gt Terrestrische Pflanzen 600 Gt
Stoffflüsse Seesedimente 0.04 Gt a-1 Moore 0.1 Gt a-1 Talsperren 0.6 Gt a-1
Page 9 Research focus: rising levels of DOC* *DOC=dissolved organic carbon
DOC-levels in Rappbode reservoirs nearly doubled over the past 20 years
Data: Fernwasserversorgung Elbaue-Ostharz
Page 10 Problems in the waterworks: stability of flocculation, sludge production & desinfection byproducts, …
Raw water after flocculation
Purified water Raw water
Sludge Source: LTV Sachsen
Page 11 DOC-Eintrag durch hydrologische Extremereignisse Heavy rainfall in Kyrill 2007 & late summer 2002 Heavy rainfall in 60 late summer 2007 Eckertalsperre (NI)
50 TS Eibenstock (SN) Aabachtalsperre (NW) 40 Heavy rainfall in late summer 1998 30
SAK_254 (1/m) 20
10
0 Jan. 94 Jan. 95 Jan. 96 Jan. 97 Jan. 98 Jan. 99 Jan. 00 Jan. 01 Jan. 02 Jan. 03 Jan. 04 Jan. 05 Jan. 06 Jan. 07 Jan. 08 Jan. 09 Quelle: LTV Sachsen Page 12