Environmental Impacts Of The Regulation Of The
Shinano River, Niigata Prefecture, Japan
Author(s)
M. Sane, H. Yamagishi, M. Tateishi & T. Izumia
Abstract
The coastal zone of Niigata Prefecture is severely affected by erosion. This study
was developed to investigate the relationships between river regulation and
changes to the coastal zone. Regulation of the Shinano River began during the
Meiji Period with the construction of a long jetty. The jetty was built to avoid the
silting of the river mouth, and allow the significant maritime trade to continue
with inland transport via the Shinano River. Additional regulation involved the
dredging of two channels southward from the mouth of the Shinano River, the
Sekiya and the Ohkozu, for the purpose of flood mitigation in the Niigata Plain.
To evaluate changes to the coastline, several approaches were used. Firstly, six
sets of aerial photographs were examined. Then, the sediments grain-size
parameters and mineral variation were analyzed to find the correspondence with
shoreline changes. As a third approach, field surveys were conducted and
historical data on the coastal process was assessed. The coast in the vicinity of
the artificial channels accreted and there was erosion on the down-drift side of
the river mouth.
Keywords: Shinano River, jetty-Ohkozu channel, Sekiya channel, erosion.
1 Introduction
In Japan, coastal erosion affects most of the shoreline along the Sea of Japan,
though seldom along the Pacific coast. The most significant changes are
observed along the coast of Niigata Prefecture especially from the mouth of the
Shinano River to the district of Joetsu. Erosion is due to several factors, mainly
Keywords
Shinano River, jetty-Ohkozu channel, Sekiya channel, erosion.
Related Book
Other papers in this volume
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