Behavior of radioactive cesium accumulation in water bodies in contaminated area by FDNPP accident
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1 Behavior of radioactive cesium accumulation in water bodies in contaminated area by FDNPP accident Seiji HAYASHI Center for Regional Environmental Research National Institute for Environmental Studies (NIES), Japan Contents 1.Introduction 2.Approach of field measurement 3.Results 4.Summary 1
2 Background Hamadori region Uda River Mano River High Cs concentration in the bottom sediment are detected in water bodies in Fukusima and the surroundings area Cs moves from originally contaminated areas to cleaner downstream water bodies Accumulated bottom areas become a longterm source of contamination Cs (kbq m 2 ) < < Niida River Ohta River Odaka River highly contaminated upper region low contaminated downstream area Concern over increase in the risk of exposure through the activities such as water use, fishery and recreation 2
3 Purpose Understanding migration properties of radioactive cesium in river basin scale Understanding actual condition of cesium accumulation into inflowing water bodies Evaluating the trend of sediment contamination in water bodies by flows & stocks analysis
4 Study area Cs-(kBq m- 2 ) < < Tokyo Uda River Basin FDNPP Lake Kasumigaura Basin Cs deposition from an airborne monitoring survey on Nov. 11th, 2011 Lake Kasumigaura Basin (2,157km 2 ) as a mildly-contaminated area Shallow eutrophied lake with long retention time (200 days). Still blocking shipment for some fishes Uda River Basin (106.3km 2 ) as a heavily-contaminated area Highly contaminated mountainous upper region compared to lowland region Dam (Matugabou dam) controlling water flow in the basin Large coastal lagoon (Matsukawaura Lagoon )as an accumulation place 4
5 Cs flows & stocks survey in Lake Kasumigaura basin Sakura Riv. Survey against 7 main inflow rivers Hokota Riv. Sonobe Riv. Tomoe Riv. Koise Riv. Seimei Riv. Runoff survey: Measuring flow rates, turbidities and SS conc. to calculate SS flux after the accident. Sampling river waters during rain runoff events Measuring Cs activities associated with SS and dissolved Sediment survey: Temporal change analysis by stationary sampled core at three points Measuring Cs accumulation at 68 points by core sampling on Dec., 2012 and Oct., 2013 Ono Riv. Lake Kasumigaura :Observatory of flow rate and turbidity :sediment core sampling point Cs accumulation in basin (Bq m- 2 ) <2,500 2,500 5,000 5,000-10,000 10,000-20,000 20,000 30,000 30,000 40,000 40,000 50,000 50,000 < 5
6 Cs flows & stocks survey in Uda River Basin Matugabou Dam (Lake Udagawa) Discharge & turbidity survey point Discharge & turbidity survey point Coastal sea area Matsukawaura Lagoon : Sediment core sampling point : Runoff survey at forested catchment : Survey point of river-bed sediment Runoff survey Cs runoff from forested area Cs outflow flux from the upstream dam Cs flux and runoff ratio from the whole basin Sediment survey Cs accumulation amount and profile in the bottoms of upstream dam Longitudinal variation of Cs activity in the river-bed sediment Spatial distribution and total deposition of Cs in the lagoon 6
7 Behavior of radioactive Cs in the Lake Kasumigaura Basin 7
8 Cs runoff from main inflow rivers catchments of Lake Kasumigaura Relationship between Cs activity associated with SS and SS concentration Relationship between Cs activity associated with SS and deposition amount in catchment Cs activity in SS (Bq/g-SS) Seimei R. Ono R. Sonobe R Ṫomoe R. Sakura R. Hokota R. Koise R. Cs deposition amount (kbq/m 2 ) Cs activity associated with SS depending on not conc. of SS but initial deposition amount in catchment 8
9 Cs runoff from main inflow rivers catchments of Lake Kasumigaura Estimated runoff volume of Cs associated with suspended solid from main inflow rivers catchments for two years after FDNPP accident River name Sakura Koise Ono Seimei Sonobe Tomoe Hokota Land use (%) Forest Farmland Paddy Urban SS specific runoff volume (kg/m 2 ) Cs specific runoff volume(kbq/m 2 ) Cs deposition amount (kbq/m 2 ) Cs runoff ratio (%) Cs slightly run off in catchment scale 9
10 Change in spatial distribution of Cs accumulation in sediment of the Lake Kasumigaura Estimated spatial distributed map of Cs accumulation in sediment by spline function using activities of sediment cores at 68 points December, 2012 October, 2013 :sampling point Cs accumulation (kbq m 2 ) < < 18 kbq/m 2 (to 15cm depth) 15 kbq/m 2 (to 15cm depth) 19 kbq/m 2 (to 25cm depth) Higher activities in the western side Effect of initial direct deposition Locally high activities at some river mouths Effect of inflow from the river Change in Cs accumulation Slightly increase?, Promotion of vertical mixing 10
11 Analysis of stocks and flows of Cs in the Kasumigaura Basin in 21 months after the accident Inflow of Cs associated with SS from land 0.12kBq/m 2 (0.17TBq ) [Deposition annual runoff ratio(0.5%) 21/12] Accumulation in the sediment per unit area derived from land 1.0kBq/m 2 Deposition over the basin s entire land area 14kBq/m 2 (19TBq) Inflow of dissolved Cs from land (< 0.03kBq/m 2 ) Direct deposition on the lake surface 10kBq/m 2 Accumulation in the sediment 18kBq/m 2 (2.9TBq) Outflow from lake Unknown but small Small contribution of Cs associated with SS both in the past and future? Large effect of direct deposition on the lake surface and the runoff of radioactive Cs from impervious soon after deposition on the accumulation in the sediment 11
12 Temporal change of dissolved Cs in the Lake Kasumigaura St. 3 St. 3 St. 7 St. 9 妙岐ノ St. 7 St. 9 Increase of Cs concentration In summer effect of NH 4+ production in sediment? 12
13 Effect of sediment environment on production of dissolved Cs Relation of NH 4+ concentration in the lake bottom water to distribution condition of Cs between sediment surface layer and lake water Marked growth and decomposition of algae Generation of reduction condition and NH 4+ in lake sediment Promotion of Cs solubilization from solid phase Concern about the effect on Cs transition to aquatic ecosystem and agricultural food Same phenomena possibly occurring in eutrophied lakes and ponds in Fukushima prefecture 13
14 Behavior of radioactive Cs in the Uda River Basin 14
15 Cs runoff from forested area in the Uda River Basin Cs associated with SS is main component of runoff ( Kd > 10 5 ) Slight decrease in Cs concentration from 2012 to 2013 Very limited runoff of Cs even in highly contaminated region Relationship between Cs activity associated with SS and SS concentration Runoff volume and ratio of Cs associated with SS Cs deposition (kbq/m 2 ) Catchment 1 (34.6ha) No.1 Catchment Catchment No Conc. of Cs associated with SS Lake Udagawa 11±4.6 18±6.3 (kbq/kg) (Matsugabou Dam) Runoff volume of Cs associated with SS(kBq/m 2 ) Catchment 2 Cs runoff ratio(%) (115ha)
16 Accumulation of Cs in sediment of dam lake Matsugabou Dam (Lake Udagawa) Spatial distribution of Cs accumulation Behavior of inflow Cs associated with SS highly depending on flow property in the lake Behavior in highly accumulated area Current inflow sediment shielding initial Cs deposition layer Direct deposition & initial inflow? 335kBq/m 2 485kBq/m 2 434kBq/m 2 703kBq/m 2 Oct., 2013 Oct, 2013 Nov.,
17 Cs retention function of dam lake Observed hydrologic data in Lake Uda area Precipitation Typhoon Typhoon Inflow volume retention ratio to inflow Cs to dam lake Cs outflow SS outflow Cs conc.) 1- Cs inflow (catchment deposition runoff ratio) (kg)*30,000(bq/kg) 300,000(Bq/m 2 )* (m 2 )* = SS inflow volume from forested area Discharge volume Discharge control for reservation of irrigation water and flood prevention + Surface layer intake most inflow SS and Cs accumulating to bottom sediment SS outflow volume Role of dam in prevention of the proliferation of Cs to downstream area was confirmed 17
18 Cs runoff from the entire Uda River Basin Cs associated with suspended solid (SS) Observed river flow rate and SS load(jul to Jan. 2014) Cs Runoff condition from the entire basin Total runoff amount associated with SS:0.35kBq/m 2 (34GBq) Cs runoff ratio :0.17%(Jul to Jan ) Cs runoff is currently limited from the whole basin as well as forested area. 18
19 Spatial distribution of rcs concentration profile in the bottom sediment of Matsukawaura Lagoon 134 Cs + Cs (Bq/kg sediment) Sediment core sampling points Sediment depth (cm) West Mid west North Mid East West A 2 B 1 Koizumi R. M1 M2 M3 3 Uda R. C J M4 15 H G Mid west M5 South west E 9 13 I D K North F M6 Mid East South east South west South east Ume R. L 11 19
20 Relationship between sediment property and rcs concentration in the Matsukawaura Lagoon Relationship between radioactive Cs concentration and organic and muddy contents in the surface layer (0 5 cm) at the all of sampling points IL MCR MCR: ratio of fraction < 63μmto total content of sediment Distribution property of accumulated Cs Multiple contribution by inflow amount and flow property in the lagoon. Detailed survey and utilization of numerical simulation model are currently underway. 20
21 Effect of sediment inflow from the catchment on Cs accumulation in Matsukawaura Lagoon Spatial distribution of Cs accumulation on the bottom sediment of Matsukawaura Lagoon Total accumulation of Cs to 20cm depth on July, 2013: 220GBq (29kBq/m 2 ) Koizumi R. Uda R. Inflow amount of Cs associated with SS from the catchment (170km 2 ) Total deposition annual runoff elapsed years on the catchment ratio after the accident (25TBq) (0.11%) (2.4 年 ) = 68GBq 9.2kBq/m 2 on the bottom sediment Cs(kBq/m 2 ) Ume R. Sediment inflow probably has the role in Cs accumulation in the lagoon. Reflecting the difference of contamination level between upstream and downstream area Outflow from the lagoon to coastal sea should be considered for more precise estimation. 21
22 Summary of behavior of radioactive cesium accumulation in water bodies Direct deposition and initial inflow from land strongly contributed to current Cs accumulation condition in water bodies. Further accumulation into water bodies in a cleaner region with highly contaminated upper region should be considered. Role of dam in the prevention of proliferation of Cs to downstream area was confirmed, but production of bioavailable Cs from accumulated Cs should be examined. 22
23 Thank you for your attention! 23
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