English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The purpose of this study is to investigate the seasonal changes of the DAIpo value (Diatom Assemblage Index to organic water pollution) and RPID (River Pollution Index) in summer (from 1 June to 31 August) and winter (from 1 November to 28 February) of rivers in the Hokuriku District. The average and histogram of DAIpo were obtained for 112 stations in four river basins. From these data, the following results were obtained. There was no obvious difference in the average of DAIpo for all investigated stations between two seasons. But in the Tedori- gawa River Basin and the rivers in the Noto Peninsula, DAIpo values had a tendency to be higher in winter than in summer, while those in the Kakehashi River Basin and the Iburibashi River Basin showed reverse tendency. In the River Tedori-gawa RPID values were higher in winter than in summer. In the downstream of the River Kakehashi- gawa and its tributary (canal), RPID were higher in winter or almost equal between two seasons. Increase of the river discharge by snow- melt and the pollution load imposed by agriculture should be taken as important factors controlling the seasonal changes of the water quality in the rivers of Hokuriku District.

rikusuigaku zasshi/rikusuigaku zasshi

A numerical water assessment of rivers in Hokuriku district using epilithic diatom assemblage on river bed as a biological indicator. (III). Seasonal changes of the diatom assemblage index to organic water pollution (DAIpo) and river pollution index (RPID).