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Estimation of Outflow and Nutrient Load Based on the Turbidity Function in Rivers in Sanriku District Japan

Author(s): Kunihiko Hamagami, Keita Orito, Ryu Sugawara

Linked Author(s): Kunihiko Hamagami

Keywords: Sanriku coast, nutrient load, outflow, HQ curve; turbidity

Abstract: The Sanriku coastal area has suffered serious damage from the Great East Japan Earthquake that occurred on March 11, 2011. Five years have passed since the earthquake, and reconstruction of the aquaculture industry is progressing. In order to achieve sustainable development and promotion, it is necessary to correctly understand the environment of the Sanriku coastline. Sanriku Coast is a type of enclosed coastal sea called a rias coast; hence, substances such as nitrogen and phosphorus from rivers flow out and affect water quality. In this study, in order to consider outflow characteristics and nutrient load in two Sanriku rivers, the outflows, water depths and water qualities were observed of each by periodic field observation. The nutrient loads of the Sanriku River are estimated using the HQ curve and LQ equation. As a result, it reveals that there is no unique relationship between the quantity of outflow and the nutrient load, and consequently the error becomes sometimes large. A hypothesis is deduced that the data variation is not considered that leads to this error. The turbidity is then focused in this study which can be observed continuously


Year: 2017

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