Water Crisis of Lake Taihu, China
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1 FEW Workshop: Food, Energy, and Water Nexus in Sustainable Cities Water Crisis of Lake Taihu, China Guangwei Zhu Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences
2 Contents 1. Cyanobacterial Blooms at Lake Taihu 2. Drinking water crisis at May of Actions after water crisis of Challenges remained 5. Conclusion
3 1. Cyanobacterial Blooms at Lake Taihu
4 Where is Lake Taihu? 太湖, Lake Taihu, 3 th largest Freshwater
5 Catchment of Taihu: floodplain, urbanlization Water surface: 2338 km 2 Zhenjiang Average depth: 2 m Maximal depth: 3 m Catchment: km 2 Changzhou Wuxi Population density: >1200 Suzhou Shanghai Huzhou Jiaxing Hangzhou
6 Functions of Taihu 1. City water supply West Taihu 2. Fishery 3. Recreation 4. Flood buffer 5. Water way East Taihu
7 Water intakes in Taihu Water intakes for water plants in Taihu.
8 Fishery Culter alburnus Basilewsky Hemisalanx prognathus Exopalaemon modestus Aristichthys nobilis Coilia nasus Temminck et Schlegel Hyriopsiscumingii Hypophthalmichthys molitrix Pelteobagrus fulvidraco Eriocheir sinensis Milne-Edwards
9 Cyanobacterial blooms in Taihu
10 History of blooms in Taihu 1950 s 1970 s
11 Major player: Microcystis spp. Photos by Gregory Boyer, at May Microcystis spp. in Taihu Microcystis aeruginosa Microcystis wesenbergii Microcystis flos-aquae
12 Supporting actor: Anabaena spp. Photos by Gregory Boyer, at May
13 Problem caused by blooms: Microcystin D-Glu (iso) CO 2 H CH 3 N Methyl dehydroala (Mdha) CH 2 R O NH O NH R Adda O CH 3 H D-Ala 3 C S OCH 3 O NH O S S 1 NH CH CH 3 3 O S R NH Leu CH 3 CH 3 S CH 3 NH O CO 2 H 2 MeAsp (iso) Arginine NH NH 2 NH Su et al., Toxins, 2015
14 Problem caused by blooms: Black patch Black patch at northwest bay of Taihu, June 22, 2015 Dimethyl trisulfide (DMTS); Geosmin; 2-MIB; β-cyclocitral, β-ionone; 2-isobutyl-3-methoxypyrazine (IBMP)
15 2. Drinking water crisis at May of 2007
16 Water crisis caused by black patch in Taihu Water crisis happened at Wuxi during May 29 3 Jun 2007, for the block of intake at Gonghu blocked by black patch.
17 The major odor compounds Dimethyl Trisulfide (DMTS): During the crisis A kind of volitile compound produced at anaerobic condition with plenty of corruptive organic matters, for example, the died algae. The Next year, 2008 Chen et al, 2010
18 The cause 1: Extreme serious bloom Serious bloom start 8 April, a month earlier than normal.
19 The cause 2: Extreme warmer spring Spring Water temperature Spring Air temperature Qin et al, 2010
20 The cause 3: Suitable wind direction
21 3. Actions after water crisis of 2007
22 The total investigation is over 100 billions RMB Catchment: Fertilization control Ecological restoration Water hyacinth In lake: Bloom collection Sediment dredging Ecological engineering
23 A example: Monitor and forecast of bloom
24 Why we need monitoring and forecast Bloom and black patch are very patched in spatial. The density of bloom or black patch are depend on weather. To remove the toxin or odors from water need time and money. 13:37, Aug 5, :27, Aug 12, :09, Aug 13, 2009
25 Monitor 1: near shoreline check everyday Checking area: 569 km 2 Route length: 209 km Stop and measure sites: 24 Dates: 194 days April 10 to Oct 20 Variables recording: Weather: wind speed; wind direction Water temp Air temp Algal: Cell density Chlorophyll a Water: DO; ph; Eh Secchi depth Odor
26 Special designed aeration boat
27 Monitor 2: Remote sensing image interpret bloom Chlorophyll a Temperature Suspended solid Transparency Data sources: HJ CCD MODIS MERIS GOCI Interpret model: APPLE model or 3 wavelengths model: nm; nm; > 730nm
28 Monitor report of Taihu bloom by remote senser
29 Monitor 3: High-frequency buoy monitor Weather station Energy: wind and solar radiation panel YSI sonde: Chl-a, DO, PC, Turb, ph, Cond, Temperature, et al. Bottom DO sensor Wave and current sensors
30 Buoy distribution
31 Buoy types EMB01 EMB02 EMB03 EMB4 EMB5 EMB6 EMB7 水环境自动监测站点分类 EMB08 EMB10 EMB11 EMB12 EMB13 EMB14
32 Forecast the bloom Stereo-monitoring system in Lake Taihu Model development and calibration Model calcultion Model result Model calibration Field data 3D model Chl-a DO Chlorophyll a and DO model
33 Possibility of bloom and black patch calculation P bloom, black patch =ƒ 1,DO (O) ƒ 2,Wind (V) ƒ 3, Rain (R) ƒ 4,Chl (B) DO mg/l f(o) Wind speed m/s f(v) Rain f(r) Chl-a µg/l F(B) < Sunny 1 > Cloudy Light rain Moderate >8 0.4 >10.8) 0.5 Heavy rain 0 <10 0.1
34 3-days forecast report
35 Possible reaction of local managers Water plants: Change the intake site, or use Yangtze river as source. Tourism agency: Change the travel lines. Monitoring agency: Pay more attention to High possible zone. Bloom emergency team: adjust the collection power.
36 4. Challenge remained
37 Nutrient reduction still far from bloom control COD Mn (mg/l) y = -0.44ln(x) R² = TP (mg/l) y = 0.14x R² = 年 2008 年 2009 年 2010 年 2011 年 2012 年 2013 年 2014 年 Ammonia mg/l y = -0.14ln(x) R² = TN mg/l y = -0.69ln(x) R² = 年 2008 年 2009 年 2010 年 2011 年 2012 年 2013 年 2014 年 年 2008 年 2009 年 2010 年 2011 年 2012 年 2013 年 2014 年
38 The bloom is still heavy
39 Conclusion Taihu, similar to Lake Chaohu and Lake Dianchi in China, suffered from cyanobacterial bloom for more than 30 years. The major trouble maker is Microcystis spps. In Chaohu and Dianchi, Anabeana spps also are one of the major players. The biggest challenge in these lakes is the safety of city water supply. Being the spatial drift or movement behaviors of Microcystis bloom, to monitor and forecast the risk of bloom and black patch events for short time in these lakes are very possible. The ability of technology to solve bloom is limited. The pollution is a social and economic issue, too. To solve the problem, more social and economic solution should be introduced.
40 Thank you for your attention!
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