Groundwater Resources, Development And
Management In The Largest Tectonic
Sedimentary Basin, Japan
Author(s)
T. Tanaka
Abstract
The purpose of this paper is to show a typical example of excessive extraction of
groundwater resources and their resulting problems suffered in the economic
growth period in Japan from 1955 to 1972. In the case of the study basin, this
problem has been remedied by the implementation of regulations over the past
50 years and the relatively high recharge rate due to the natural hydrologic
conditions of the area. Environmental consequences according to the excessive
groundwater development and strategies for groundwater resource management
are discussed, based on the Japanese experiences during the past 50 years.
Keywords: tectonic sedimentary basin, groundwater resources, excessive
extraction, land subsidence, countermeasures, regulation law, monitoring
system.
1 Introduction
The Kanto Plain is the largest tectonic sedimentary basin in Japan as shown in
fig. 1. The plain is underlain by Pliocene and Pleistocene sediments of the Kanto
Tectonic Basin, consisting of unconsolidated layers of silt, sand and gravel
which extend to a depth of more than 3,000 m. Figure 2 shows the east-west
geologic cross section across the Tokyo Metropolitan area to a depth of around
500 m below the sea level. These sediments form the main confined groundwater
aquifers in the Kanto Plain.
Keywords
tectonic sedimentary basin, groundwater resources, excessive
extraction, land subsidence, countermeasures, regulation law, monitoring
system.
Related Book
Other papers in this volume
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