Mizoguchi, Masaru
Published in
Paddy and Water Environment
Radiocesium released from Fukushima Daiichi nuclear power plant in March 2011 was accumulated in paddy fields within 5 cm of the surface soil layer. In order to remove this radiocesium, Japanese government carried out decontamination work to strip off surface layer soil. For this reason, the paddy fields of Iitate Village of Fukushima Prefecture ar...
Ueta, Tatsuya Nishimura, Shin-Ichi Imaide, Kazunari Shibata, Toshifumi Shuku, Takayuki
Published in
Paddy and Water Environment
Natural slopes and cut slopes frequently collapse due to heavy rain and earthquakes, causing disasters. Countermeasures must be applied to mitigate such disasters. There is an especially high risk of a collapse at the surface layer of slopes, and thus, evaluating the strength distribution in the surface layer in detail is important to mitigating an...
Koshiyama, Naoko Ootsu, Takeshi Nakamura, Kazumasa
Published in
Paddy and Water Environment
Hokkaido is an important agricultural area of Japan. The amount of arable land managed per farming household has been increasing because of the aging of farmers and the decreasing number of agricultural households. To improve labor productivity, increasing the size of paddy fields and developing groundwater-level control systems have been promoted ...
lee, Younghak Park, Jaesung Fujisawa, Kazunori Murakami, Akira Lee, Dalwon
Published in
Paddy and Water Environment
In the zone fill-type reservoir embankment, the vertical filter for drainage is essentially installed, but in the case of the horizontal filter, the applicability is determined by the reservoir’s scale or the importance grade of the facility. In particular, horizontal filters are not installed in small reservoirs (with a height less than 30 m) whic...
Kondoh, Tadashi Nagasaka, Yoshisada Kato, Atushi Shindo, Hayato Kato, Masaya Saito, Masanori Fujiwara, Koki Yamamoto, Satoshi Yaji, Yukio
Published in
Paddy and Water Environment
We measured nutrient inflows and outflows on reclaimed land (157 km2, including 100 km2 of paddy fields) in Lake Hachiro. The net effluent loads (NELs) in 2017 were 3.5 × 105 kg nitrogen (N), 6.1 × 104 kg phosphorous (P), and 2.4 × 107 kg suspended solids (SS). The largest monthly NEL was 7.4 × 104 kg N, 1.6 × 104 kg P, and 8.1 × 106 kg SS, in May....
Choi, Dong-Ho Beom, Jin-A Jeung, Min-Hyuk Choi, Woo-Jung Her, Young-Gu Yoon, Kwang-Sik
Published in
Paddy and Water Environment
Rice growing in paddy fields equipped with irrigation and drainage systems is less affected by unfavorable weather patterns such as prolonged dry periods and severe storms, but for the same reason, the fields discharge water to maintain suitable water depths even between rainfall events. Studies have been done to examine the quality of water draine...
Ikeura, Hiroshi Phongchanmixay, Sengthong Chomxaythong, Amphone Matsumoto, Naruo Kawamura, Kensuke Homsengchanh, Laeh Inkhamseng, Somphone
Published in
Paddy and Water Environment
Irrigated areas in the Lao People’s Democratic Republic (Laos) constitute only 12% of the total agricultural land. Most of the lowland rice is cultivated under rainfed conditions. The rice yield in rainfed fields is lower and more unstable than that in irrigated fields. Most of the lowland rice fields in Savannakhet Province, which is the main rice...
Inosako, Koji Saito, Tadaomi Omachi, Kana
Published in
Paddy and Water Environment
In a monsoon climate, salt accumulates not only in drylands, but also in paddy fields during the dry season. Because natural desalinization by gravitational drainage is very difficult in paddy fields, drainage facilities are needed to remove salts from affected paddy fields. A rice husk underdrainage system (RHUS) is one applicable method. Although...
Adachi, Yasuhisa
Published in
Paddy and Water Environment
Dynamic aspects of colloidal dispersion form a critical basis of the engineering science of soil and water quality when the relation between microscopic physicochemical and hydrodynamic conditions and macroscopic hydrological transport phenomena is considered. Examples in the paddy and environment can be found in the transportation and diffusion of...
Dissanayaka, K. D. C. R. Rajapakse, R. L. H. L.
Published in
Paddy and Water Environment
This paper focuses on and analyses the potential hydrological impacts of climate change on the hydrologic regime of the Kelani River basin, Sri Lanka. In this research, future basin-wide hydrology is simulated by using downscaled temperature and precipitation outputs from the Canadian Earth System Model, version 2 (CanESM2), and the Hydrologic Engi...
