Earth hummock. Earth hummocks are among the periglacial phenomena. The knoll covered with vegetation is |about 0.5 m high.| J-STAGE
Gullfoss waterfall. The two-step cataract has a total drop of 32 m.| J-STAGE
Lakagigar fissure eruption. The 1783-84 Laka- gigar eruption resulted in a great famine, due to which Iceland lost 20% of its population.| J-STAGE
The braided course of the Jokulfell downstream from Hofsjokull.| J-STAGE
Palagonite ridge formed by subglacial eruption. Langjokull glacier in the background.| J-STAGE
Basaltic lava field, the Svartshengi geothermal power plant (right), and the Blue Lagoon (left).| J-STAGE
Normal fault at Thingvellir. The boundary between the North American plate on the left-hand side and the Eurasian to the right.| J-STAGE
Geyser Strokkur. The geyser erupts at 5-10 minute intervals.| J-STAGE
Reykjavik is a smokeless city. Almost 100% of the electricity and the heating depends upon hydropower and geothermal energy.| J-STAGE
Jokulsarlon lagoon. The Breidamerkurjokull glacier has been retreating since about 1920. The lagoon formed at the glacial front shows a yearly increase.| J-STAGE
Valley of Eldgja. The 934-40 Eldgja eruption occurred along a 75 km-long fissure.| J-STAGE
Dettifoss waterfall. The waterfall is 44 m high. The river water is rich in suspended sediments and the waterfall volume is the greatest in Iceland.| J-STAGE

Latest Issue

Journal of Geography (Chigaku Zasshi), 2023 Vol.132 No.2

2023 Vol.132 No.2

A Well with a Hand Pump in Shinagawa Area, Central Tokyo

This well is located in an alluvial lowland area in the western coastal part of Tokyo Bay. In Shinagawa area, there still remain a number of wells with hand pumps, which were used as domestic water sources in the past. This well is 9.1 m deep and its screen width is unknown. The hand pump on this well is covered with an orange cloth because it is currently out of order.
Although the public sewerage coverage ratio of Tokyo’s Shinagawa area is 99.5% (Bureau of Sewerage Tokyo Metropolitan Government¹⁾), the results of an end member mixing analysis (EMMA) based on the δ¹⁵N-NO₃ and nitrogen concentration suggest sewage is seeping into the groundwater sampled from this well. And its Cl⁻ concentration is higher than that of groundwater sampled in nearby areas. Meanwhile, other water quality results indicate a lower NO₃⁻ concentration (n.d. –5 mg/L), a higher HCO₃⁻ concentration (120–200 mg/L), and a lower ORP_SHE (50–200 mV), despite seasonal variations, which are signs of denitrification under an anaerobic environment (Itoh et al., 2023).

(Photograph: Yuki ITOH; Explanation: Seongwon LEE)

Note

1) https://www.gesui.metro.tokyo.lg.jp/living/a2/spread/tasseinennzi/index.html [Cited 2023/1/28].

Reference

[Itoh, Y., Yasuhara, M., Lee, S., Nakamura, T. and Inamura, A. (2023): Groundwater contamination by nitrate ions in the highly urbanized Shinagawa area, central Tokyo, Japan. Journal of Geography (Chigaku Zasshi), 132, 141–160. (in Japanese with English abstract)]

Special Issue: Groundwater Pollution by Nitrate: Past, Present, and Future Perspectives

Overview of the Special Issue
“Groundwater Pollution by Nitrate: Past, Present, and Future Perspectives”

Norio TASE, Masaru YAMANAKA, Seongwon LEE,
Takashi NAKAMURA and Yu TABAYASHI

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 67.

DOI:10.5026/jgeography.132.67

Preface of the Special Issue on
“Groundwater Pollution by Nitrate: Past, Present, and Future Perspectives”

Norio TASE, Masaru YAMANAKA, Seongwon LEE,
Takashi NAKAMURA and Yu TABAYASHI

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 71.

DOI:10.5026/jgeography.132.71

Global Approaches to Address the Nitrogen Issue:
Expected Effects on Groundwater Nitrate Pollution (Review Article)

Kentaro HAYASHI

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 75.

DOI:10.5026/jgeography.132.75

Efforts of the Ministry of Environment
to Address Groundwater Pollution by Nitrate Nitrogen (Review Article)

Tatemasa HIRATA

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 93.

DOI:10.5026/jgeography.132.93

Groundwater Pollution by Nitrate Nitrogen and Livestock Waste Management
(Review Article)

Kiyonori HAGA

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 107.

DOI:10.5026/jgeography.132.107

Background, Controlling Factors and Characteristics
of Groundwater Pollution by Nitrate Nitrogen at Alluvial Fans (Review Article)

Masaru YAMANAKA

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 127.

DOI:10.5026/jgeography.132.127

Groundwater Contamination by Nitrate Ions
in the Highly Urbanized Shinagawa Area, Central Tokyo, Japan (Original Article)

Yuki ITOH, Masaya YASUHARA, Seongwon LEE,
Takashi NAKAMURA and Akihiko INAMURA

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 141.

DOI:10.5026/jgeography.132.141

Kumamoto City Measures to Reduce Nitrate Pollution:
Example of New Efforts to Address Domestic Animal Waste Mainly
from Dairy Farming and Meat Production (Short Article)

Tsutomu NAGATA, Michiko OTSUZUKI and Takayuki SATO

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 161.

DOI:10.5026/jgeography.132.161

Nitrogen Discharge from Livestock Wastes Thrown in Unlined Pit
and Denitrification around the Pit (Short Article)

Seongwon LEE and Norio TASE

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 169.

DOI:10.5026/jgeography.132.169

Nitrogen Contamination and Denitrification Occurrence in Shallow Groundwater
of Urbanized Area at Kathmandu Valley, Nepal (Original Article)

Takashi NAKAMURA, Ken’ichi OSAKA,
Saroj Kumar CHAPAGAIN and Kei NISHIDA

Journal of Geography (Chigaku Zasshi), 2023, 132(2), 183.

DOI:10.5026/jgeography.132.183

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