Migration of biogenic substances through the aeration zone
Author:
LITVINAITIS Andrius1ORCID, BAGDŽIŪNAITĖ-LITVINAITIENĖ Lina1ORCID
Affiliation:
1. Department of Environment Protection and Water Engineering, Vilnius Gediminas Technical University, Saulėtekio al., 11, Vilnius, Lithuania
Abstract
The article presents the migration of biogenic substances in the aeration zones of different sedimentary riverbanks.
Sand and loam sediments in Lithuanian river basins are studied, and experimental research is carried out under
natural conditions by increasing the loads of biogenic substances. The modeling was performed using the modeling
program CHMFLO-2000. It was established that the transport of total nitrogen by the river water is formed by the
amounts of nitrates, which make up 92–97% of the total transport in individual seasons. Nitrates account for 15–23%
of the total nitrogen transport through sediment surface and groundwater runoff. The regularities of vertical and horizontal
migration of biogenic substances have been established and defined. The suitability of the modeling program
CHEMFLO-2000 for modeling the transport processes of ammonium ions, nitrates and nitrites by underground runoff
on the banks of Lithuanian rivers has been confirmed, the applicable constants for modeling have been provided.
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