SAWAMOTO Masaki 澤本正樹

… Alternative Names

SAWAMOTO M. 沢本正樹

Less

Researcher Number	90016519
External Links
Affiliation (based on the past Project Information) *help	2007: 東北大学, 大学院・工学研究科, 教授 2006: 東北大学, 大学院工学研究科, 教授 1997 – 2004: TOHOKU UNIVERSITY,DEPARTMENT OF CIVIL ENGINEERING,PROFESSOR, 大学院・工学研究科, 教授 1993 – 1996: 東北大学, 工学部, 教授 1992: 北海道大学, 工学部, 教授 1987 – 1991: Tohoku University, Professor, 工学部, 教授 1986: 東北大, 工学部, 助教授
Review Section/Research Field	Principal Investigator 水工水理学 / Hydraulic engineering / Natural disaster science Except Principal Investigator Hydraulic engineering / 水工水理学 / 水工水理学 / Natural disaster science
Keywords	Principal Investigator NOAA / 国土数値情報 / 河口過程 / JAIDAS / Abukuma River / River Mouth Process / 河口砂州 / 阿武隈川 / 融雪流出 / 地球環境 … More / 衛星計測 / Sand Drift / Wave / Cylinder / Local scour / 非平衡性漂砂量 / 不安定理論 / 砂漣 / 局所洗掘 / 非平衡漂砂量 / Tideland / Circulation model / Nutrient salt / Substance transport / Ecology / Rivermouth / 閉鎖性内湾 / 淡塩水 / 非点源流出 / 干潟栄養塩 / 河口生態系 / ベントス / 蒸発散 / SS / フミン物質 / 生態系 / 河口域 / 干潟 / 循環モデル / 栄養塩 / 物質輸送 / 生態 / 河口 / Sediment Balance / Sendai Bay Coast / Sediment Movement / 海岸浸食 / 海岸侵食 / 漂砂 / 総合土砂収支 / 土砂収支 / 仙台湾海岸 / 土砂動態 / Granular Material / Channel Inception / Wave Boundary Layer / Sheet Flow Regime / Sediment Transport / シートフロー / 移動床 / 構成則 / 粒状体 / 水路形成 / 波動境界層 / シートフロー状砂移動 / 土砂移動 / Rivermouth Closure / Rivermouth Effluent / Saline Intrusion / Sand Barrier / Rivermouth Process / 感潮域 / 塩水侵入 / 河口閉塞 / 河口流出 / 塩水進入 / Support System / Database / Satellite Image / NOAA衛星 / 衛星リモートセンシング / 支援システム / データベース / 衛星画像 / Image Processing / Laser Scan / Flow Visualization / レ-ザスキャン / 画像処理 / レ-ザ・スキャン / 可視化 / River Mouth Sand Barrier / Nanakita River / Medium And Small Rivers / Mogami River / Iwaki River / Tohoku District / 七北田川 / 中小河川 / 最上川 / 岩木川 / 河口処理 / 東北地方 / 只見川 / MOSー1 / MOS-1 … More Except Principal Investigator 漂砂 / River mouth / 海岸工学 / 河川工学 / 流砂 / 海岸 / 河川 / 河口 / JERS-1 / ERS-1 / 土砂収支 / 災害文化 / 自然災害 / Program / Exercise / Demonstration / Computer Graphics / Hydraulic Engineering Education / Education of Fluid Mechanics / 可視化 / アニメーション / 流体力学 / 水文学 / コンピューター・グラフィックス / 教育 / パソコン・グラフィックス / 海岸工学教育 / 水理学教育 / 水工学教育 / 数値流体力学 / 流体力学教育 / Beach erosion / Coastal sedimentation / River sedimentation / Sediment budget analysis / 海岸侵食 / Littoral drift / Sedimentation / Coast / River / 海浜過程 / Rainfall-runoff / River basin geomorphology / Land cover classification / Optical sensor / Synthetic aperture radar / Remote sensing / 地球資源衛星 / 欧州リモートセンシング衛星 / 分布型流出モデル / 流出解析 / 河川地形 / 降雨流出 / 流域地形 / 土地被覆分類 / 光学センサー / 合成開口レーダー / リモートセンシング / 非定常乱流実験 / 非線形波動 / 波の変形 / 水理実験法 / デ-タ処理 / 数値流体 / 大規模渦 / 緩勾配方程式 / 乱流構造 / 砕波 / クラスター解析 / ウルマーシラトビゲラ / コガタシマトビケラ / HSI / HIS / 水温分布 / 分布型水文流出モデル / GIS / 生物多様性 / 病原性細菌 / ダイナミックウェイブモデル / 洪水氾濫 / 大腸菌群 / 水系感染症 / メコン河 / 土砂輸送 / 洪水 / 浮遊砂 / 採水器 / 水質 / 生態学 / 海岸保全 / 閉鎖性海域 / 環境 / 沿岸域 / 防災施設 / ハザードマップ / 災害のリスク / 歴史的変遷 / 強風 / 地震災害 / 津波 / 豪雨洪水 / 地震 Less

HAZARD MAP OF WATERBORNE INFECTION DISEASE IN THE MEKONG FLOODING AREAS
- Principal Investigator
  
  KAZAMA So
- Project Period (FY)
  2006 – 2009
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  水工水理学
- Research Institution
  Tohoku University
広域における生物多様性判定手法の開発
- Principal Investigator
  
  風間聡
- Project Period (FY)
  2006 – 2008
- Research Category
  
  Grant-in-Aid for Exploratory Research
- Research Field
  
  水工水理学
- Research Institution
  Tohoku University
Development of nutrient circulation model for ecological system control in estuaryPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  2002 – 2004
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  水工水理学
- Research Institution
  TOHOKU UNIVERSITY
Sediment budget analysis for large areas in Japan
- Principal Investigator
  
  TANAKA Hitoshi
- Project Period (FY)
  2002 – 2004
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  水工水理学
- Research Institution
  Tohoku University
Evaluation of total sediments movement on the Abukuma River and the Sendai Bay CoastPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1999 – 2001
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  水工水理学
- Research Institution
  TOHOKU UNIVERSITY
Summarizing of river mouth processing method based on comparative study on river mouth in Japan
- Principal Investigator
  
  TANAKA Hitoshi
- Project Period (FY)
  1998 – 2000
- Research Category
  
  Grant-in-Aid for Scientific Research (A).
- Research Field
  
  水工水理学
- Research Institution
  Tohoku University
Analysis on sediment transport under wave action as particle-fluid interacting systemPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1996 – 1998
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  水工水理学
- Research Institution
  TOHOKU UNIVERSITY
洪水用簡易浮遊砂採水器の開発
- Principal Investigator
  
  MANO Akira
- Project Period (FY)
  1995
- Research Category
  
  Grant-in-Aid for Developmental Scientific Research (B)
- Research Field
  
  水工水理学
- Research Institution
  Tohoku University
Comparative Study on Rivermouth Process in JapanPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1995 – 1997
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  水工水理学
- Research Institution
  TOHOKU UNIVERSITY
漂砂環境の創造と長期的保全に関する研究
- Principal Investigator
  
  河田恵昭
- Project Period (FY)
  1994
- Research Category
  
  Grant-in-Aid for Co-operative Research (B)
- Research Field
  
  Natural disaster science
- Research Institution
  Kyoto University
DEVELOPMENT OF SATELLITE IMAGE DATABASE SUPPORT SYSTEM FOR ESTIMATION OF METEOROLOGICAL DISASTER POTENTIALPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1993 – 1994
- Research Category
  
  Grant-in-Aid for Developmental Scientific Research (B)
- Research Field
  
  Natural disaster science
- Research Institution
  TOHOKU UNIVERSITY
Verification of Applicability of ERS Data to River Basin Geomorphology and Runoff Analysis
- Principal Investigator
  
  TAKARA Kaoru
- Project Period (FY)
  1992 – 1994
- Research Category
  
  Grant-in-Aid for Co-operative Research (A)
- Research Field
  
  Hydraulic engineering
- Research Institution
  KYOTO UNIVERSITY
  Gifu University
資料の収集・解析に基づく自然災害に対するリスクの比較研究
- Principal Investigator
  
  高木不折
- Project Period (FY)
  1991
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Research Institution
  Nagoya University
資料の収集・解析に基づく自然災害に対するリスクの比較研究
- Principal Investigator
  
  高木不折
- Project Period (FY)
  1991 – 1992
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Research Institution
  Nagoya University
NOAA,MOSー1,国土数値情報デ-タを用いた融雪出水機構に関する研究Principal Investigator
- Principal Investigator
  
  澤本正樹
- Project Period (FY)
  1990
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Research Institution
  Tohoku University
NOAA、MOS-1、国土数値情報を用いた融雪出水機構に関する研究Principal Investigator
- Principal Investigator
  
  澤本正樹
- Project Period (FY)
  1989
- Research Category
  
  Grant-in-Aid for Scientific Research on Priority Areas
- Research Institution
  Tohoku University
Comparison of River Mouth Process in Tohoku DistrictPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1989 – 1990
- Research Category
  
  Grant-in-Aid for Co-operative Research (A)
- Research Field
  
  Hydraulic engineering
- Research Institution
  Tohoku University
Development of Laser Scan Lighting System for Flow VisualizationPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1989 – 1990
- Research Category
  
  Grant-in-Aid for Developmental Scientific Research (B).
- Research Field
  
  Hydraulic engineering
- Research Institution
  Tohoku University
砕波帯内の流体運動に関する総合的研究
- Principal Investigator
  
  服部昌太郎
- Project Period (FY)
  1988 – 1989
- Research Category
  
  Grant-in-Aid for Co-operative Research (A)
- Research Field
  
  Hydraulic engineering
- Research Institution
  Chuo University
Co-operative Studies on the Development of Personal Computer Soft Ware for Effective Education of Hydraulics and Hydro-Engineering
- Principal Investigator
  
  HINO M.
- Project Period (FY)
  1987 – 1988
- Research Category
  
  Grant-in-Aid for Co-operative Research (A)
- Research Field
  
  Hydraulic engineering
- Research Institution
  Tokyo Institute of Technology
Study on Unequilibrium Sediment Transport Rate and Local Scour around StructuresPrincipal Investigator
- Principal Investigator
  
  SAWAMOTO Masaki
- Project Period (FY)
  1986 – 1987
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  Hydraulic engineering
- Research Institution
  TOHOKU UNIVERSITY

All 2009 2007 2006

All Journal Article

[Journal Article] Evaluation of flood control and inundation conservation in Cambodia using flood and economic growth models2009
- Author(s)
  So Kazama, Tatsuhito Kono, Kengo Kakiuchi, Masaki Sawamoto
- Journal Title
  
  Hydrological Processes Vol.23, No.4
  
  Pages: 623-632
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Effect of canalization on inundation and suspended sediment deposition in the Plain of Reeds, Mekong Delta, Vietnam2007
- Author(s)
  Pham Ngoc, So Kazama, Masaki Sawamoto
- Journal Title
  
  Proceedings of 32nd Congress of IAHR A1・b
  
  Pages: 1-10
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Effect of canalization on inundation and suspended sediment deposition in the Plain of Reeds, Mekong Delta, Vietnam2007
- Author(s)
  Pham Ngoc, So Kazama, Masaki Sawamoto
- Journal Title
  
  Proceedings of 32nd Congress of IAHR, Theme A1.b (CD-ROM)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] 水理氾濫モデルを用いた水系感染症患者数の季節変動解析2007
- Author(s)
  相澤寿樹, 風間聡, 渡部徹, 沢本正樹
- Journal Title
  
  水工学論文集 51
  
  Pages: 1189-1194
- NAID
  130004043909
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Characterization of firefly habitat using a geographical information system with hydrological simulation2007
- Author(s)
  So Kazama, Satoru Matsumoto, Priyantha Ranjan, Hiroshi Hamamoto Masaki Sawamoto
- Journal Title
  
  Ecological Modelling 209・2-4
  
  Pages: 392-400
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18656137
[Journal Article] Evaluation of groundwater resources in wide inundation areas of the Mekong River basin2007
- Author(s)
  So Kazama, Terumichi Hagiwara, Priyantha Ranjan, Masaki Sawamoto
- Journal Title
  
  Journal of Hydrology 3-4, 340
  
  Pages: 233-243
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Evaluation of groundwater resources in wide inundation areas of the Mekong River basin2007
- Author(s)
  So Kazama, Terumichi Hagiwara, Priyantha Ranjan, Masaki Sawamoto
- Journal Title
  
  Journal of Hydrology 340・3-4
  
  Pages: 233-243
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] 数値地図情報ならびに水文モデルデータを用いたHSIモデルによる生物生息域の推定2007
- Author(s)
  風間聡, 松本哲, 沢本正樹
- Journal Title
  
  土木学会論文集B 63・4
  
  Pages: 323-337
- NAID
  130004468069
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18656137
[Journal Article] 水理氾濫モデルを用いた水系感染症患者数の季節変動解析2007
- Author(s)
  相澤寿樹, 風間聡, 渡部徹, 沢本正樹
- Journal Title
  
  第51巻
  
  Pages: 1189-1194
- NAID
  130004043909
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Effect of canalization on inundation and suspended sediment deposition in the Plain of Reeds2007
- Author(s)
  Pham Ngoc, So Kazama, Masaki Sawamoto
- Journal Title
  
  Mekong Delta, Vietnam, Proceedings of 32nd Congress of IAHR,Theme A1.b CD-ROM
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] Evaluation of groundwater resources in wide inundation areas of the Mekong River basin2007
- Author(s)
  So Kazama, Terumichi Hagiwara, Priyantha Ranjan, and Masaki Sawamoto
- Journal Title
  
  Journal of Hydrology 340(3-4)
  
  Pages: 233-243
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] 水理氾濫モデルを用いた水系感染症患者数の季節変動解析2007
- Author(s)
  相澤寿樹, 風間聡, 渡部徹, 沢本正樹
- Journal Title
  
  水工学論文集 51(印刷中)
- NAID
  130004043909
- Data Source
  KAKENHI-PROJECT-18404008
[Journal Article] HSIモデルによる生物生息場推定を利用した流域環境評価2007
- Author(s)
  風間聡, 松本哲, 沢本正樹, 浜本洋
- Journal Title
  
  土木学会論文集B 63・4
  
  Pages: 338-350
- NAID
  130004468070
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18656137
[Journal Article] HSIモデルを用いた流域生物多様性の評価2006
- Author(s)
  浜本洋, 風間聡, 沢本正樹
- Journal Title
  
  環境工学論文集 43
  
  Pages: 559-567
- NAID
  130003949555
- Data Source
  KAKENHI-PROJECT-18656137

1. MANO Akira (50111258)

# of Collaborated Projects: 5 results

# of Collaborated Products: 0 results
2. NADAOKA Kazuo (70164481)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
3. NAGAO Masatomo (20198302)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
4. TANAKA Hitoshi (30171755)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
5. IZUMI Norihiro (10260530)

# of Collaborated Projects: 4 results

# of Collaborated Products: 0 results
6. UCHIJIMA Kunihide (40003181)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
7. KAZAMA So (50272018)

# of Collaborated Projects: 3 results

# of Collaborated Products: 14 results
8. OMURA Tatsuo (30111248)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
9. SASAKI Mikio (30118195)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
10. KUROKI Mikio (50002001)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
11. YAMADA Tadashi (80111665)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
12. TOHMA Satoshi (00002915)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
13. 首藤伸夫 (90055137)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
14. 高木不折 (50023057)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
15. 近藤純正 (30004493)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
16. 平野宗夫 (50037850)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
17. 佐藤忠信 (00027294)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
18. 浅岡顕 (50093175)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
19. 渡部徹 (10302192)

# of Collaborated Projects: 2 results

# of Collaborated Products: 3 results
20. NAGABAYASHI Hisao (70102431)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
21. MAEKAWA Katsuro (40007076)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
22. ISHII Chimataro (80006676)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
23. HIRAYAMA Ken-ichi (10001140)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
24. TAKARA Kaoru (80144327)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
25. NOGAMI Michio (50087144)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
26. KOIKE Toshio (30178173)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
27. SHIBA Michiharu (90026352)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
28. GOTOH Hitoshi (40243068)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
29. NISIMURA Osamu (80208214)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
30. SAKAI Shigeki (80091643)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
31. MATSUTOMI Hideo (20134083)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
32. NISHIZAWA Masaru (00005505)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
33. HINO M. (30016323)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
34. OOHASHI M. (90160598)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
35. IKEDA Y. (20202898)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
36. 河田恵昭 (10027295)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
37. 入江功 (10213258)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
38. 磯部雅彦 (20114374)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
39. 村岡浩爾 (90029017)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
40. 服部昌太郎 (90055070)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
41. 酒井哲郎 (30026182)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
42. 渡辺晃 (80011138)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
43. 岩田好一朗 (10029150)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
44. 安田禎輔 (20059207)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
45. 藤田睦博 (80001139)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
46. 清水英範 (50196507)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
47. 砂田憲吾 (20020480)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
48. 福西祐 (60189967)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
49. 石川忠晴 (50159696)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

SAWAMOTO Masaki 澤本 正樹

SAWAMOTO M. 沢本 正樹

Research Projects

Research Products

Co-Researchers

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Development of nutrient circulation model for ecological system control in estuaryPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Evaluation of total sediments movement on the Abukuma River and the Sendai Bay CoastPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Analysis on sediment transport under wave action as particle-fluid interacting systemPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Comparative Study on Rivermouth Process in JapanPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

DEVELOPMENT OF SATELLITE IMAGE DATABASE SUPPORT SYSTEM FOR ESTIMATION OF METEOROLOGICAL DISASTER POTENTIALPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Institution

NOAA,MOSー1,国土数値情報デ-タを用いた融雪出水機構に関する研究Principal Investigator

Principal Investigator

SAWAMOTO Masaki 澤本正樹

SAWAMOTO M. 沢本正樹