異なる河川流出強度下での栄養塩輸送経路およびそのインパクトゾーンの解明

2014 Fiscal Year Annual Research Report

• Project/Area Number: 25881005
• Research Institution: Okayama University
• Principal Investigator: 齋藤 光代 岡山大学, その他の研究科, 助教 (20512718)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: 海洋物理・陸水学 / 河川 / 地下水 / 栄養塩

Outline of Annual Research Achievements

本研究では，淡水－海水混合域における栄養塩の輸送過程について，異なる淡水流出強度下における定量的評価を行うことを目標とし，1. 瀬戸内海の中でも特に閉鎖性の高い海域の沿岸部を対象に，水温，塩分，酸素・水素安定同位体比（δ18O, δD）およびラドン（Rn-222）をマルチトレーサーに用いた淡水由来栄養塩のインパクトゾーンおよび輸送経路（河川水および地下水経由）の推定を行うとともに，2. それにともなう沿岸低次生態系の応答について検討することを目的とした．H26年度は，主に大阪湾沿岸域を対象に淡水流出強度の異なる二つの時期（晩夏および冬季）における現地観測を実施し，河口から約10km沖合までの水温，塩分，δ18O，δD，栄養塩類（窒素およびリン）およびRn-222の空間分布を確認するとともに水試料および堆積物試料の採取と分析を行い，得られた結果に基づく解析を行った．
その結果，Rn-222については全体的に濃度レベルが低く，対象区間では明瞭な地下水流出傾向が確認できなかったのに対し，河川水および下水処理場からの放流水由来の淡水のインパクトゾーンが季節によって変化する傾向が確認された．特に，晩夏は河口のごく近傍に比較的明瞭な淡水－塩水境界が存在し，栄養塩濃度は河口近傍の表層において最も高く，その後沖合に向かって低下する傾向がみられた．一方で，冬季は鉛直混合の卓越にともない表層から底層にかけてより沖合まで全体的に塩分が低下する傾向がみられ，クロロフィルaおよび溶存酸素濃度（DO）も比較的高く，植物プランクトンの生産が活発になっている可能性が示唆された．

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] 沿岸地下水流出域におけるリン動態 (2015)
  • Author(s): 齋藤光代・小野寺真一
  • Journal Title: 地球環境 Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation for the effect of non-stationary nutrient transport on the coastal seaweed cultivation in western Japan. (2015)
  • Author(s): Saito, M., Onodera, S., Hidaka, G. and Tokumasu, M.
  • Journal Title: Proceedings of the International Association of Hydrological Sciences (PIAHS) Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation of drought impact on groundwater recharge rate by SWAT and Hydrus Model in an agricultural island, western Japan. (2015)
  • Author(s): Jin, G., Shimizu, Y., Onodera S., Saito, M. and Matsumori K.
  • Journal Title: Proceedings of the International Association of Hydrological Sciences (PIAHS) Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Open Access
• [Journal Article] Estimation of the climate change effect on the long-term variation in river water temperature in a temporal snow-covered watershed. (2015)
  • Author(s): Maruyama, Y., Onodera, S., Kitaoka, K., Saito, M. and Shimizu, Y.
  • Journal Title: Proceedings of the International Association of Hydrological Sciences (PIAHS) Volume: 印刷中 Pages: 印刷中
  • Peer Reviewed / Open Access
• [Journal Article] Estimation of long term nutrient loadings into a hypereutrophic artificial lake in lowland catchment, western Japan. (2015)
  • Author(s): Shimizu, Y., Onodera, S., Jin, G. and Saito, M.
  • Journal Title: Proceedings of the International Association of Hydrological Sciences (PIAHS) Volume: 368 Pages: 337-342
  • DOI: doi: 10.5194/piahs-368-337-2015
  • Peer Reviewed / Open Access
• [Journal Article] 大量施肥農業流域における不圧地下水中での溶存N2Oの空間分布特性． (2014)
  • Author(s): 大西晃輝・小野寺真一・齋藤光代・清水裕太・金 広哲
  • Journal Title: 陸水学雑誌 Volume: 75 Pages: 1-11
  • Peer Reviewed / Open Access
• [Journal Article] Effect of physical and morphometric factors on nutrient removal in agricultural ponds. (2014)
  • Author(s): Saito, M., Okubo, K., Onodera, S., Takagi, S., Maruyama, Y., Shimizu, Y., Jin, G. and Aritomi, D.
  • Journal Title: Proceedings of 9th IWA International Symposium on Waste Management Problems in Agro-Industries (AGRO2014) Volume: 1 Pages: 616-621
• [Journal Article] Nitrous oxide emission with submarine groundwater discharge in an agricultural watershed affected by significant fertilizer application. (2014)
  • Author(s): Onodera, S., Onishi, K., Saito, M., Aritomi, D., Onodera, K., Maruyama, Y., Jin, G. and Shimizu, Y.
  • Journal Title: Proceedings of 9th IWA International Symposium on Waste Management Problems in Agro-Industries (AGRO2014) Volume: 2 Pages: 196-203
• [Journal Article] Vertical distribution of sediment phosphorus from Lake Hachirogata; considering land reclamation effects on phosphorus accumulation. (2014)
  • Author(s): Jin, G., Onodera, S., Saito, M., Maruyama, Y., Hayakawa, A., Sato, T., Ota, Y. and Aritomi, D.
  • Journal Title: Proceedings of 9th IWA International Symposium on Waste Management Problems in Agro-Industries (AGRO2014) Volume: 2 Pages: 620-627
• [Journal Article] Nutrient component of groundwater in agricultural land. (2014)
  • Author(s): Onodera, S., Tase, N., Terada, R., Saraiva, F., Hirata, R., Saito, M. and Maruyama, Y.
  • Journal Title: Proceedings of Workshop on Water, Nitrogen and agriculture in the State of Sao Paulo, Brazil Volume: - Pages: 41-44
• [Presentation] Evaluation for the effect of non-stationary nutrient transport on the coastal seaweed cultivation in western Japan. (2015)
  • Author(s): Saito, M., Onodera, S., Hidaka, G. and Tokumasu, M.
  • Organizer: 26th International Union of Geodesy and Geophysics (IUGG)
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 2015-06-22 – 2015-07-02
• [Presentation] Evaluation of drought impact on groundwater recharge rate by SWAT and Hydrus Model in an agricultural island, western Japan. (2015)
  • Author(s): Jin, G., Shimizu, Y., Onodera S., Saito, M. and Matsumori K.
  • Organizer: 26th International Union of Geodesy and Geophysics (IUGG)
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 2015-06-22 – 2015-07-02
• [Presentation] Estimation of the climate change effect on the long-term variation in river water temperature in a temporal snow-covered watershed. (2015)
  • Author(s): Maruyama, Y., Onodera, S., Kitaoka, K., Saito, M. and Shimizu, Y.
  • Organizer: 26th International Union of Geodesy and Geophysics (IUGG)
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 2015-06-22 – 2015-07-02
• [Presentation] 沿岸藻場分布域における地下水流出の評価 (2015)
  • Author(s): 齋藤光代・小野寺真一・古森 旭・大久保賢治・有冨大樹・金 広哲・丸山 豊
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
  • Year and Date: 2015-05-24 – 2015-05-24
• [Presentation] 農業用貯水池における成層構造の季節変化とその栄養塩循環への影響 (2015)
  • Author(s): 大久保賢治・齋藤光代・舩岡亮平・小野寺真一・金 広哲・丸山 豊
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
  • Year and Date: 2015-05-24 – 2015-05-24
• [Presentation] Nitrogen dynamics in a tidal river zone influenced by highly urbanization, western Japan. (2014)
  • Author(s): Saito, M., Onodera, S., Shimizu, Y., Maruyama, Y., Jin, G. and Aritomi, D.
  • Organizer: American Geophysical Union 2014 Fall Meeting
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] Effect of subsurface flow on nutrient transport between a eutrophic coastal lake and agricultural reclamation land. (2014)
  • Author(s): Onodera, S., Saito, M., Jin, G., Hayakawa, A. and Maruyama, Y.
  • Organizer: American Geophysical Union 2014 Fall Meeting
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2014-12-14 – 2014-12-19
• [Presentation] Effect of physical and morphometric factors on nutrient removal in agricultural ponds (2014)
  • Author(s): Saito, M., Okubo, K., Onodera, S., Takagi, S., Maruyama, Y., Jin, G., Aritomi, D., Le, H. T., Funaoka, R. and Shimizu, Y.
  • Organizer: 2014 9th IWA International Symposium on Waste Management Problems in Agro-Industries
  • Place of Presentation: Kochi, Japan
  • Year and Date: 2014-11-24 – 2014-11-26
• [Presentation] Nitrous oxide emission with submarine groundwater discharge in an agricultural watershed affected by significant fertilizer application. (2014)
  • Author(s): Onodera, S., Onishi, K., Saito, M., Aritomi, D., Onodera, K., Maruyama, Y., Jin, G. and Shimizu, Y.
  • Organizer: 2014 9th IWA International Symposium on Waste Management Problems in Agro-Industries
  • Place of Presentation: Kochi, Japan
  • Year and Date: 2014-11-24 – 2014-11-26
• [Presentation] Vertical distribution of sediment phosphorus from Lake Hachirogata; considering land reclamation effects on phosphorus accumulation. (2014)
  • Author(s): Jin, G., Onodera, S., Saito, M., Maruyama, Y., Hayakawa, A., Sato, T., Ota, Y. and Aritomi, D.
  • Organizer: 2014 9th IWA International Symposium on Waste Management Problems in Agro-Industries
  • Place of Presentation: Kochi, Japan
  • Year and Date: 2014-11-24 – 2014-11-26
• [Presentation] 瀬戸内海沿岸域における藻場の空間分布に及ぼす地下水流出の影響の検討 (2014)
  • Author(s): 齋藤光代・小野寺真一・金 広哲・丸山 豊・有冨大樹・大久保賢治
  • Organizer: 生物地球化学研究会
  • Place of Presentation: 京都
  • Year and Date: 2014-10-25 – 2014-10-26
• [Presentation] Phosphorus distribution in sediment profile from Lake Hachirogata; considering land reclamation effects on phosphorus accumulation. (2014)
  • Author(s): Jin, G., Onodera, S., Saito, M., Hayakawa, A., Sato, T. and Ota, Y.
  • Organizer: 生物地球化学研究会
  • Place of Presentation: 京都
  • Year and Date: 2014-10-25 – 2014-10-26
• [Presentation] 潮間帯における藻場の空間分布とそれに及ぼす地下水流出の影響の検討． (2014)
  • Author(s): 齋藤光代・小野寺真一・金 広哲・丸山 豊・有冨大樹
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] 湖底湧水の推算法に関する考察． (2014)
  • Author(s): 大久保賢治・齋藤光代・柴田健志
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] Variation of nutrients and chlorophyll-a in North Basin of Lake Biwa for the last few decades. (2014)
  • Author(s): Le, T. H., Okubo, K. and Saito, M.
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] The estimation of water balance in Ikuchi Island by SWAT and Hydrus Model. (2014)
  • Author(s): Jin, G., Shimizu, Y., Onodera S., Saito, M. and Matsumori K.
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] 沿岸地下水におけるリンのホットスポットに関する研究． (2014)
  • Author(s): 福岡正人・小野寺真一・齋藤光代・清水裕太・金 広哲・佐藤高晴・山本民次・北岡豪一・大久保賢治・早川 敦・宮岡邦任
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] 河川近傍の天然池が有する水質浄化作用 (2014)
  • Author(s): 丸山 豊・齋藤光代・小野寺真一・北岡豪一
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] 花崗岩不圧帯水層中の溶存亜酸化窒素の鉛直分布とその時系列変化． (2014)
  • Author(s): 有冨大樹・小野寺真一・齋藤光代・大西晃輝・丸山 豊
  • Organizer: 日本水文科学会学術大会
  • Place of Presentation: 広島大学
  • Year and Date: 2014-10-04 – 2014-10-04
• [Presentation] Estimation of long term nutrient loadings into a hyper eutrophic artificial lake in lowland catchment, Japan. (2014)
  • Author(s): Shimizu, Y., Onodera, S., Jin, G. and Saito, M.
  • Organizer: RSHS14 and ICGHWE14
  • Place of Presentation: Sun Yat-Sen University, China
  • Year and Date: 2014-08-24 – 2014-08-27
• [Presentation] Nutrient Dynamics in the Tidal Zone of Polluted River in Osaka Metropolitan City of Japan, Considering Seasonal Variations and Groundwater Exchange. (2014)
  • Author(s): Onodera, S., Saito, M., Shimizu, Y., Maruyama, Y., Jin, G., Miyaoka, K. and Aritomi, D.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2014
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-08-01 – 2014-08-01
• [Presentation] Effect of Surface Water - Groundwater Interaction on Nutrient Enrichment in Hachiro-gata Area. (2014)
  • Author(s): Onodera, S., Saito, M., Hayakawa, A., Jin, G., Maruyama, Y., Aritomi, D. and Sato, T.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2014
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-08-01 – 2014-08-01
• [Presentation] Comparison of Sediment Phosphorus Profiles from Lake Hachirogata, in Consideration of Groundwater Flow Effect. (2014)
  • Author(s): Jin, G., Onodera, S., Saito, M., Maruyama, Y., Hayakawa, A., Sato, T., Ota, Y. and Aritomi, D.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2014
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-08-01 – 2014-08-01
• [Presentation] Comparative Research of the Recovery from Eutrophic Condition in Japanese Tidal Lakes. (2014)
  • Author(s): Jin, G., Onodera, S., Li, G., Saito, M. and Shimizu, Y.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2014
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-08-01 – 2014-08-01
• [Presentation] Estimation of Groundwater Flow with Bypass Flow in River-groundwater Interaction Zone of the Costal Alluvial Fan, Using Seasonal Variations of Temperature, δ18O, and Nutrient Concentration. (2014)
  • Author(s): Maruyama, Y., Onodera, S., Saito, M. and Kitaoka, K.
  • Organizer: Asia Oceania Geosciences Society (AOGS) 2014
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-07-31 – 2014-07-31
• [Presentation] 瀬戸内沿岸海水中でのラドン・ラジウム核種の空間分布およびその影響要因． (2014)
  • Author(s): 齋藤光代・小野寺真一・太田朋子・郭 新宇・武岡英隆・大西秀次郎・窪田卓見
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 沿岸地下水流出域におけるリン動態に関する近年の研究動向 (2014)
  • Author(s): 齋藤光代・小野寺真一
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 大和川感 潮域における栄養塩動態の季節変化． (2014)
  • Author(s): 小野寺真一・齋藤光代・清水裕太・丸山 豊・宮岡邦任・金 广哲・有冨大樹
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 地表水-地下水交流とその栄養塩輸送に及ぼす影響－八郎潟の例 (2014)
  • Author(s): 小野寺真一・齋藤光代・早川 敦・金 广哲・丸山 豊
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] Contrasting vertical phosphorus profiles in sediment of Hachirogata ; considering water flow effect. (2014)
  • Author(s): Jin, G., Onodera, S., Ota, Y., Sato, T., Saito, M., Hayakawa, A. and Aritomi, D.
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 成層安定度に基づくため池の類型化及び生態系指標に関する検討． (2014)
  • Author(s): 大久保賢治・齋藤光代・高木真也・小野寺真一・丸山豊・金广哲・有冨大樹・清水裕太
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 瀬戸内海島嶼部における地下水利用－尾道市瀬戸田町生口島の事例－． (2014)
  • Author(s): 谷口智雅・小野寺真一・高橋英博・齋藤光代・清水裕太
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 山地農業流域における地下水中の酸素安定同位体比および硝酸態窒素濃度の季節変化． (2014)
  • Author(s): 有冨大樹・小野寺真一・齋藤光代・丸山豊・金广哲・大西晃輝
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 扇状地河川近傍の河川―地下水交流特性－酸素安定同位体比と栄養塩濃度分布による評価－． (2014)
  • Author(s): 丸山豊・小野寺真一・齋藤光代・北岡豪一
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 水文流出モデルによる河川からのリン輸送量推定の現状と課題 (2014)
  • Author(s): 清水裕太・小野寺真一・齋藤光代
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30
• [Presentation] 八郎潟調整池の堆積物柱状試料における岩石磁気測定の鉛直分布特性－干拓地建設の影響－． (2014)
  • Author(s): 太田雄貴・佐藤高晴・小野寺真一・金广哲・齋藤光代・早川 敦
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-30 – 2014-04-30