著者

品川 守 舘谷 清 山口 甲

出版者

公益社団法人 土木学会

雑誌

水工学論文集 (ISSN:09167374)

巻号頁・発行日

no.36, pp.305-310, 1992

被引用文献数

2

---

Eighty years have passed since systematic improvement of the Ishikari River started in 1910. Before the improvements, the Ishikari River was in a completely natural state, and caused floods every year due to its meandering stream. The goal of the improvements was to further the development of Hokkaido by rcelaiming the vast marshes along the Ishikari River. The improvement work involved channel improvement of river, mainly by (1) excavating short-cuts to shorten the river and lower the flood stage, and (2) construction of continuous embankments to prevent floods.<BR>As a result, flood protection has improved remarkably and allowed the development of new residential areas. Flood prevention and reduction in water-levelsby the short-cuts have changed the Ishikari Marshes to fertile arable land.<BR>This study will clarify how channel improvements in the Ishikari River executed for regional development contributed to a change in flood flows and decreases in floods.

著者

品川 守 舘谷 清 山口 甲

出版者

Japan Society of Civil Engineers

雑誌

水工学論文集 (ISSN:09167374)

巻号頁・発行日

vol.36, pp.305-310, 1992-02-20 (Released:2010-06-04)

参考文献数

2

被引用文献数

3 2

---

Eighty years have passed since systematic improvement of the Ishikari River started in 1910. Before the improvements, the Ishikari River was in a completely natural state, and caused floods every year due to its meandering stream. The goal of the improvements was to further the development of Hokkaido by rcelaiming the vast marshes along the Ishikari River. The improvement work involved channel improvement of river, mainly by (1) excavating short-cuts to shorten the river and lower the flood stage, and (2) construction of continuous embankments to prevent floods.As a result, flood protection has improved remarkably and allowed the development of new residential areas. Flood prevention and reduction in water-levelsby the short-cuts have changed the Ishikari Marshes to fertile arable land.This study will clarify how channel improvements in the Ishikari River executed for regional development contributed to a change in flood flows and decreases in floods.

著者

渡辺 和好 舘谷 清 松木 賢治 星 清

出版者

Japan Society of Civil Engineers

雑誌

水理講演会論文集 (ISSN:09134131)

巻号頁・発行日

vol.33, pp.55-60, 1989-02-25 (Released:2010-06-04)

参考文献数

7

---

Operational comparisons are presented using the optimization techniques to identify the parameters in Sugawara' s Tank model which has been widely employed for long-term runoff analysis. Themathematical optimization techniques tested herein are both the Powell and Newton methods. Computational burden is too stringent in the application of the Powell method to parameter optimization in the Tank model, because a great number of runoff computations are required. The efficiency of optimization performance resulting from use of the Newton method clearly depends on how effectively the sensitivity coefficients can be derived. An important feature of the proposed approach is the theoretical derivation of sensitivity coefficients which can directly be used in the optimization scheme of the Newton method.A vector differential equation in terms of storages in the four tanks is numerically integrated using the transition matrix which is computed by expanding the matrix exponential. The elements of this transition matrix play a significant role in eliminating additional computations involved in the solution of sensitivity coefficients. On the basis of the simulation results, the Newton method coupled with sensitivity coefficients appears to have potential performance advantages for optimizing the parameters in the Tank model.