CHARACTERISTICS OF DISASTER-RELATED INFORMATION IN CASE OF THE HEAVY RAIN EVENT OF JULY 2018 ―A CASE STUDY OF OKAYAMA, HIROSHIMA, AND EHIME PREFECTURES―

Abstract On 29 October 2000, the Hana region of Maui received 700 mm of rain in 7 h. Radar analyses revealed that the storm consisted of seven cells that were initiated along the southeast slope of Haleakala volcano. One of these cells survived for nearly 4 h and was responsible for 80% of the volumetric rainout from the storm. The interaction of low-level flow distorted by the island of Hawaii located farther east, the passage of a trough, and the topographic forcing caused by Haleakala volcano were major factors responsible for the evolution of the storm.

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Lesson from the Heavy Rain Event of July 2018

JOURNAL OF RURAL PLANNING ASSOCIATION ◽

10.2750/arp.37.366 ◽

2019 ◽

Vol 37 (4) ◽

pp. 366-368

Author(s):

Hidenori MORITA

Keyword(s):

Heavy Rain ◽

Rain Event ◽

Heavy Rain Event

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Export of <sup>134</sup>Cs and <sup>137</sup>Cs in the Fukushima river systems at heavy rains by Typhoon Roke in September 2011

Biogeosciences Discussions ◽

10.5194/bgd-10-2767-2013 ◽

2013 ◽

Vol 10 (2) ◽

pp. 2767-2790 ◽

Cited By ~ 30

Author(s):

S. Nagao ◽

M. Kanamori ◽

S. Ochiai ◽

S. Tomihara ◽

K. Fukushi ◽

...

Keyword(s):

Nuclear Power ◽

Heavy Rain ◽

Rain Event ◽

Normal Flow ◽

Flow Conditions ◽

Pulse Input ◽

Heavy Rain Event ◽

Coastal Marine ◽

Rain Events ◽

Heavy Rains

Abstract. Effects of a heavy rain event on radiocesium export were studied at stations on the Natsui River and the Same River in Fukushima Prefecture, Japan after Typhoon Roke during 21–22 September 2011, six months after the Fukushima Daiichi Nuclear Power Plant accident. Radioactivity of 134Cs and 137Cs in river waters was 0.011–0.098 Bq L−1 at normal flow conditions during July–September in 2011, but it increased to 0.85 Bq L−1 in high flow conditions by heavy rains occurring with the typhoon. The particulate fractions of 134Cs and 137Cs were 21–56% in the normal flow condition, but were close to 100% after the typhoon. These results indicate that the pulse input of radiocesium associated with suspended particles from land to coastal ocean occurred by the heavy rain event. Export flux of 134Cs and 137Cs by the heavy rain accounts for 30–50% of annual radiocesium flux in 2011. Results show that rain events are one factor controlling the transport and dispersion of radiocesium in river watersheds and coastal marine environments.

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Impact of a severe rain event on C- and N-DBP precursor removal using IEX

Water Science & Technology Water Supply ◽

10.2166/ws.2018.033 ◽

2018 ◽

Vol 18 (6) ◽

pp. 2092-2099

Author(s):

K. Doederer ◽

Z. Ilieva ◽

J. Keller

Keyword(s):

Ion Exchange ◽

Heavy Rain ◽

Health Concern ◽

Rain Event ◽

Heavy Rain Event ◽

Removal Capacity ◽

C And N ◽

Pre Treatment ◽

Rain Events ◽

Magnetic Ion

Abstract During disinfection, dissolved organic matter (DOM) is the major precursor to form disinfection by-products (DBPs), which may be of potential human health concern. Previous research focused on waters of continental climates and less on subtropical environments. However, water sources in subtropical climates are regularly impacted by major rain events during the summer months. This study evaluated the C- and N-DBP precursor removal capacity of two conventional ion exchange (IEX) resins and one magnetic ion exchange (MIEX) resin with a raw water at normal conditions and impacted by a heavy rain event. The rain event introduced 3 mg C/L total organic carbon (TOC) comprised mainly of low to medium molecular weight organics. All three resins were able to remove TOC and DBP precursors (>66%) but being less efficient in reducing turbidity (3–48%) and colour (9–24%). The resin with the smallest bead size was affected the most by the increased medium MW DOM loading resulting in DOM and C-DBP precursor removal performance losses of 10% and 22%. When applied as a pre-treatment for coagulation, MIEX was more efficient in DBP precursor control than coagulation in addressing the additional organic and DBP precursor loading after a heavy rain event.

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