Nitrate transport process in a small coastal alluvial fan catchment

Mitsuyo Saito, Shin Ichi Onodera, Tsutomu Takei

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In order to demonstrate the nitrate transport process from land to the sea, variations in the NO3--N flux of river water were investigated, and the NO3--N flux of groundwater was estimated in a small coastal alluvial fan catchment covered by orange groves. The results are summarized as follows: 1) In the base-flow period, the NO3--N flux of river water decreased from the midstream to the downstream area with the deduction in runoff; 2) At the peak of a storm event with 11 mm of total rainfall, the NO3--N flux increased up to about 16 times that in the base-flow period. The total discharge of NO3--N during that event was estimated to be equal to that of 4 days during the base-flow period; 3) The NO3 --N concentration in groundwater was more than 20 mg L-1 at the midstream area, whereas it had declined to less than 2.0 mg L-1 in the downstream area. Based on these results, we estimated the NO3--N discharge by groundwater to the sea to be about 2.4% of the annual nitrogen input from fertilizer application, suggesting that NO3 --N was removed from groundwater by denitrification in the downstream area.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJapanese Journal of Limnology
Volume66
Issue number1
Publication statusPublished - Apr 2005
Externally publishedYes

Fingerprint

soil transport processes
alluvial fan
transport process
base flow
groundwater
baseflow
nitrates
catchment
nitrate
river water
groves
fertilizer application
denitrification
runoff
rain
rainfall
nitrogen
sea

Keywords

  • Alluvial fan
  • Groundwater
  • Nitrate
  • River water
  • Transport process

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Nitrate transport process in a small coastal alluvial fan catchment. / Saito, Mitsuyo; Onodera, Shin Ichi; Takei, Tsutomu.

In: Japanese Journal of Limnology, Vol. 66, No. 1, 04.2005, p. 1-10.

Research output: Contribution to journalArticle

Saito, Mitsuyo ; Onodera, Shin Ichi ; Takei, Tsutomu. / Nitrate transport process in a small coastal alluvial fan catchment. In: Japanese Journal of Limnology. 2005 ; Vol. 66, No. 1. pp. 1-10.
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