著者

Fumihito IETSUKA Akira WADA

出版者

Japan Society of Civil Engineers

雑誌

PROCEEDINGS OF HYDRAULIC ENGINEERING (ISSN:09167374)

巻号頁・発行日

vol.52, pp.1063-1068, 2008 (Released:2010-08-25)

参考文献数

8

---

We assumed two-dimensional advection-diffusion equation to be a basic equation and aimed to inspect the applicability of CIP method with tangent conversion through two benchmark problems. On the Skew Flow problem, we got superior results that CIP method with tangent conversion could catch a discontinuous border sharply without causing numerical oscillation. On the other hand, on the Rotating Cone problem, we got good results on the short time simulation but in the case of long time rotating cone velocity field CIP method with tangent conversion could not reproduce initial profile, so the room of improvement of the scheme is left.

著者

Masaharu FUJITA Yoshifumi SATOFUKA Shinji EGASHIRA

出版者

Japan Society of Civil Engineers

雑誌

PROCEEDINGS OF HYDRAULIC ENGINEERING (ISSN:09167374)

巻号頁・発行日

vol.50, pp.1003-1008, 2006 (Released:2010-08-25)

参考文献数

2

---

So far huge sediment production due to the eruption of Mt.Kelud has given serious damage to the Brantas river basin. On the other hand the eruption has provided soil and sand for agricultural land and construction material. So, as a first step to establishing an advanced control system both of the sediment runoff and the sediment utilization, we have investigated the change of sediment transport properties after the eruption in 1990. The field survey result shows that the sever sediment deposition occurred immediately after the eruption, but 1 year after the eruption the bed aggradation changed into the bed degradation because of active sand mining. Also we obtained the sediment supply condition at the confluences with the tributaries after the eruption and presented a way to estimate the condition. Furthermore the field observation result on wash load indicates the wash load transport rate decreased rapidly after the eruption.