Modeling of nutrient dynamics in the nepheloid layer with resuspension of bottom sediment in the Ariake Bay
| Project/Area Number |
25450258
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | Saga University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Keywords | 有明海 / 底泥 / 巻き上げ / 懸濁層 / 栄養塩 / 吸着態リン / 吸着態NH4 / 吸脱着 |
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| Outline of Final Research Achievements |
In this study, the nutrient dynamics, such as adsorption and desorption characteristics of nutrients to the bottom mud particles, in the nepheloid layer with resuspension of bottom sediment were investigated based on the field measurements in the inner area of the Ariake Bay and the laboratory experiments. As a result, the spatial and temporal variations in water quality and nutrient concentrations at neap tide were clarified in the field sea area. We found that the NH4+ and PO43- concentrations in the nepheloid layer near river mouth were thought to be influenced by the supply of NH4+and PO43- due to the violent resuspension of bottom sediment (turbidity) and the advection from rivers (salinity) based on the multi regression analysis. From the laboratory experiments, we found that the variations of NH4+ and PO43- concentrations in the aqueous suspension were caused by desorption of NH4+ and PO43- adsorbed on resuspended sediment particles, which strongly depend on SS concentration.
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Report
(4 results)
Research Products
(7 results)
