リバーフロント研究所報告第18号
Report of Riverfront Research InstituteNo.18

2007年9月

財団法人

リバーフロント整備センター

Foundation for Riverfront Improvement and Restoration

Preface
This volume contains a collection of selected papers and reports prepared as a result of the activities of
the Foundation for Riverfront Improvement and Restoration.
Our mission is to conduct research concerning various subjects including the conservation and use ofnatural waterfront environments of rivers, lakes and coasts, the hydrological cycle, the use of research
results for community improvement, the construction of "Super Levees" (high-standard levees), riverscapes,
and river navigation.
With the growing public interest in the natural environment, recent research trends are towards
focusing more than in the past on nature restoration taking river ecosystems into consideration and on theconservation and restoration of the natural environments of rivers and coasts. Research on thedevelopment of new ways to achieve the goals of nature-oriented river management is another priority in
our research efforts. The management of exotic species, which has been attracting growing attention inrecent years, is yet another priority of our research.
As the expectations for the conservation of excellent river environments grow, we feel we need tocontinue our research on the themes mentioned above, while endeavoring to strengthen the waterfront–
human relationship including community management.
This report contains a total of 30 papers ranging in topics from very basic ones that may become partof future standards for river projects to interim reports of our ongoing research. Our intent in compilingthis report is to provide information on the scope and trends of our research activities to as many people
as possible.
We are determined to continue our research efforts in order to help make Japan a safer, nature-richcountry.
Any thoughts and opinions on this report would be appreciated.

September, 2007

Kotaro Takemura
President
Foundation for Riverfront Improvement and Restoration

Takashi Sunakawa
Chief Manager
Riverfront Research InstituteReport of Riverfront Research Institute No.18 Contents

1. Research reports relating to "River Works in Harmony with Nature"
1-1 Nature restoration
Experimental research on restoration of the gravel bed of the Makomanai River,
Sapporo Hokkaido (interim report)…………………………………………………… Hiroki TAKAHASHI/Noboru MARUOKA/Kiyoshi TAKEUCHI/Keizou WATANABE……………… 1

River improvement to restore Thorea okadae habitats : Yasumuro River experience -The 4th report……………………… Kentaro TAKI/Hideyuki WATANABE/Kazuyuki SAKANOI/Fumihiro TOI/Motoi SEKI/Nobuyoshi SUGINO……………… 7

Research for riverbed excavation experiment in Awasa district, Chikuma River…………………………………………………………………………………… Shin-ichiro TATE/Minoru KOBAYASHI/Nobuyuki OHASHI…………… 15

Restoring gravel bars in the middle reaches of the Kinu River……………………………………………………………… Teruaki MASUKO/Yoshio MAEMURA/Tomokazu MISHINA/Seiji UCHIDA…………… 25

Nature restoration plan for the lower reaches of the Ishikari River…………………………………………………………………………………… Kiyoshi TAKEUCHI/Noboru MARUOKA/Satoshi DAIMON…………… 33

Restoring the gravel bars of the Ina River : verifying a hypothesis by experimental river works（interim report）…………………………………………………………………… Takayoshi TSUZUKI/Yoshifumi KODAMA/Kentaro TAKI/Satoko GOTO…………… 41

Present state and analysis of river restoration in Japan…………………………………………………………………………………………………… Susumu DOMON/Masafumi ITO/Jyunzo SAGO…………… 50

1-2 Nature-oriented river improvement projects
From nature-oriented river works to nature-oriented river management………………………… Nobuyuki OHASHI/Yasushi HORIKAWA/Minoru KOBAYASHI/Tatsuji KIMURA / Shinichi YOSHIMURA…………… 58

Classification and mapping of vegetation at Watarase Retarding Basin…… M… asanori IIJIMA/Yoshifumi KODAMA/Miwa TOMIZAWA/Satoshi KASHIWABARA/Tomoyuki ANMA/Yoshio TSUKAMOTO……… 64

Soil seed bank survey at Watarase Retarding Basin………………………………… Miwa TOMIZAWA/Yoshifumi KODAMA/Masanori IIJIMA/Toshihiro SUZUKI/Asako FUKUSHIMA…………… 72

Determining the cross section of the Ichinomiya River (Chiba Prefecture)by a simple environmental impact assessment method…………………………………………………………………………… Susumu DOMON/Hideki TAMURA/Jyunzo SAGO/Kenzo MAEDA…………… 79

Environmental problems and goals of the improvement of the Aiwari River…………………………………………………………………………………………… Mitsuru ABE/Noboru MARUOKA/Satoshi DAIMON…………… 87

On the current state and problems of nature-oriented river works
using nature-friendly methods in Gifu Prefecture…………………………………………………………………………………………………………… Kazuhiro MORITA/Yoshimasa OTAKE…………… 95

1-3 National Census on River Environments
River environment as viewed from the results of National Survey on River Environments: an overview ofthe first to third round survey results……………………………………………………………………………………………… Tetsuya OTSUKA/Satoshi MAEDA/Mitsuru ABE…………… 103

1-4 River environment
Scoping of project benefit measurement using CVM………………Akihiko NAKAYA/Minoru KOBAYASHI/Nobuyuki OHASHI/Mizuki KONNO/Suguru KATSUMOTO/Aki IWASAKI…………… 111

Robinia pseudoacacia removing effect of root removal after felling trunks and future problems…………………………………………………………………………………………………………………… Kouta TANNO/Satoshi MAEDA/…………… 119

River channel management and monitoring methods considerate of the ecosystem of the upper reaches ofthe Tone River…………………………… Masanori IIJIMA/Yoshifumi KODAMA/Miwa TOMIZAWA/Masahiro FURUMATSU/Kikuko MIYAZAKI…………… 128

A study on feasibility of Lake Biwa shore management not dependent on shore-based conservation
facilities………………………………………………… Kentaro TAKI/Yoshifumi KODAMA/Takayoshi TSUZUKI/Sadakazu ITO/Yohei KATO…………… 137

Development of a river environment management support system…………………………………………………………………………………… Yasushi HORIKAWA/Satoshi MAEDA/Nobuyuki OHASHI…………… 145

A study on river environment improvement planning from the viewpoint of river system planning: a casestudy on the Kano River System………………………………Takehiko IWASAKI/Minoru KOBAYASHI/Koji TAKAHIRA/Norihiro KAWANABE/Kazuhiro NAMIKI…………… 151

Application of DNA polymorphism analysis technology to the river environment (interim report)…………………………………………………… Kazuhisa KIDO/Katsuhiro GOTO/Jyunzo SAGO/Tatsuo OMURA/Kozo WATANABE…………… 159

2. Research reports relating to "Construction of high-standard levees"
A model study on integrated implementation of high-standard levee and urban redevelopment projects……………………………………………………………………………… Toshihiko ITO/Toshiya YAMADA/Junichi NAKAGAKI…………… 167

A study on high-standard levee projects taking advantage of regional characteristics…………………………………………………………… Tsuyoshi KONNO/Yoshio MAEMURA/Kiyotaka MATSUMOTO/Jun KOIZUMI…………… 175

Seismic performance regulations of super levees under level 2 earthquake motions………………………………………………………………………………………………………………… Hiroshi MORI/Yoshifumi KODAMA…………… 183

3. Research reports relating to "Riverfront Improvement"
Riverfront utilization efforts for the Ota River…………………………………………………… Fumihiro TOI/Yoshifumi KODAMA/Takayoshi TSUZUKI/Isao SHIOMI/Hiroshi INO…………… 190

Planning for maintenance cost reduction by allowing private use of a regulating reservoir…………………………………………………… Kenichi YAMAKI/Hideyuki WATANABE ／ Toshikazu ASANUMA ／ Shingo SHIINA…………… 199

4. Research reports relating to "Inland Waterway Transport"
A study on development of inland waterway transport………………………………………………………………………………… Katsuhiro GOTOU/Kazuyuki SAKANOI ／ Jun MOTOHASHI…………… 206

5. Research reports relating to "Hydrological cycle"
Study on global warming countermeasures in riverside urban areas……………………………………………………………………………………………Masafumi ITO/Yoshio MAEMURA/Hideki TAMURA…………… 215

Evaluating the hydrological cycle conservation system for Hachioji New Town by using the SHER Model…………………………………………………………………………………… Hideki TAMURA/Yoshio MAEMURA/Daikichi OGAWADA…………… 223

6. Research report on "the natural environment in coastal zones"
Policy for measures against washed-up trash………………………………………………………… Muneaki MASUOKA /Yoshifumi KODAMA/Hideki TAMURA/Tetsuro SHIBATA…………… 231