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79. Mean Transit Time in spring and groundwater in a forested headwater catchment in Japan – a long-term study

Author

Silveira Baptista, Isabela, Tsujimura, Maki, and Onda, Yuichi

Abstract

In this study, we applied a new methodology that utilized a combination of stable isotopic concentrations of water and SF6 atmospheric concentrations to investigate temporal variations in the spring water and groundwater MTTs of a forested headwater catchment in Japan.The main objective was to clarify how the characteristics of a forest alter its short and long-term hydrological processes in a headwater catchment. We propose a way that provides more reliable MTT estimation, as the model parameters are calibrated beforehand using apparent age information based on the SF6 data.The study area is at Mt. Karasawa, Japan, which had a 50% linear thinning in October 2011. Stable isotopes of water and SF6 analysis and hydrological observations were applied to investigate the temporal variation of MTT on three different periods: “Before Thinning”, from June 2010 to September 2011, “Soon After Thinning”, from November 2011 to December 2013 and “Long After Thinning”, from August 2017 to November 2021.The MTT of spring water and groundwater showed a tendency to become older soon after the forest was thinned, and then younger approximately 4 to 8 years after thinning occurred. In addition, we found that the average volume of the catchment increased “Soon After Thinning”, and decreased “Long After Thinning”. Therefore, the higher MTT values indicate an increase in groundwater volume storage, and shorter MTT values indicate a decrease in groundwater volume storage., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

92. Internal exposure to neutron-activated 56Mn dioxide powder in Wistar rats: part 1: dosimetry

Author

Stepanenko, Valeriy, Rakhypbekov, Tolebay, Otani, Keiko, Endo, Satoru, Satoh, Kenichi, Kawano, Noriyuki, Shichijo, Kazuko, Nakashima, Masahiro, Takatsuji, Toshihiro, Sakaguchi, Aya, Kato, Hiroaki, Onda, Yuichi, Fujimoto, Nariaki, Toyoda, Shin, Sato, Hitoshi, Dyussupov, Altay, Chaizhunusova, Nailya, Sayakenov, Nurlan, Uzbekov, Darkhan, Saimova, Aisulu, Shabdarbaeva, Dariya, Skakov, Mazhin, Vurim, Alexandr, Gnyrya, Vyacheslav, Azimkhanov, Almas, Kolbayenkov, Alexander, Zhumadilov, Kasym, Kairikhanova, Yankar, Kaprin, Andrey, Galkin, Vsevolod, Ivanov, Sergey, Kolyzhenkov, Timofey, Petukhov, Aleksey, Yaskova, Elena, Belukha, Irina, Khailov, Artem, Skvortsov, Valeriy, Ivannikov, Alexander, Akhmedova, Umukusum, Bogacheva, Viktoria, and Hoshi, Masaharu

Published
2017
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98. The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan

Author

Kinase, Takeshi, Kita, Kazuyuki, Igarashi, Yasuhito, Adachi, Kouji, Ninomiya, Kazuhiko, Shinohara, Atsushi, Okochi, Hiroshi, Ogata, Hiroko, Ishizuka, Masahide, Toyoda, Sakae, Yamada, Keita, Yoshida, Naohiro, Zaizen, Yuji, Mikami, Masao, Demizu, Hiroyuki, and Onda, Yuichi

Published
2018
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