Factors controlling nitrate concentration in space and time in wells distributed along an aquifer/river interface (Káraný, Czechia)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000023" target="_blank" >RIV/00025798:_____/19:00000023 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/19:10390487

Výsledek na webu

<a href="https://doi.org/10.1007/s10040-018-1854-7" target="_blank" >https://doi.org/10.1007/s10040-018-1854-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10040-018-1854-7" target="_blank" >10.1007/s10040-018-1854-7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Factors controlling nitrate concentration in space and time in wells distributed along an aquifer/river interface (Káraný, Czechia)

Popis výsledku v původním jazyce

Nitrate is necessary for agricultural productivity, but it is also one of the most common water contaminants in developed countries. The riverbank filtration (RBF) systems in Káraný (Czechia), with nearly 500 wells regularly distributed along 22 km of the alluvium aquifer/river interface, presents a unique field laboratory where the adverse effects of intensive agriculture on groundwater can be traced from >50 years of nitrate concentration records. The largest control over nitrate concentrations inthe RBF systems has been the mixing of the river-water component (low in nitrate) with the local recharge, which has a nitrate content of 100–250 mg/L. The mixing is mainly controlled by the intensity of the effective precipitation. Increases in nitrate concentration are caused by rapid hydraulic pulse propagation during the high-recharge periods to the discharge areas. In contrast, during dry periods, the river-water fraction dilutes nitrate in wells. The lowest nitrate content occurs above the weirs on the river, as well as in those areas where the alluvial aquifer is partly fed by older and/or denitrified groundwater from deeper zones of theunderlying sandstone aquifer. High nitrate concentrations occur in wells where the low saturated thickness of the alluvial aquifer limits the inflow of river water. This study shows that factors affecting nitrate concentrations in the alluvium are numerous, and that long-term sampling is necessary to distinguish the oscillations caused by variability in the recharge intensity from decadelong trends controlled by the fertilizer load and nitrate lag time in the aquifer.

Název v anglickém jazyce

Factors controlling nitrate concentration in space and time in wells distributed along an aquifer/river interface (Káraný, Czechia)

Popis výsledku anglicky

Nitrate is necessary for agricultural productivity, but it is also one of the most common water contaminants in developed countries. The riverbank filtration (RBF) systems in Káraný (Czechia), with nearly 500 wells regularly distributed along 22 km of the alluvium aquifer/river interface, presents a unique field laboratory where the adverse effects of intensive agriculture on groundwater can be traced from >50 years of nitrate concentration records. The largest control over nitrate concentrations inthe RBF systems has been the mixing of the river-water component (low in nitrate) with the local recharge, which has a nitrate content of 100–250 mg/L. The mixing is mainly controlled by the intensity of the effective precipitation. Increases in nitrate concentration are caused by rapid hydraulic pulse propagation during the high-recharge periods to the discharge areas. In contrast, during dry periods, the river-water fraction dilutes nitrate in wells. The lowest nitrate content occurs above the weirs on the river, as well as in those areas where the alluvial aquifer is partly fed by older and/or denitrified groundwater from deeper zones of theunderlying sandstone aquifer. High nitrate concentrations occur in wells where the low saturated thickness of the alluvial aquifer limits the inflow of river water. This study shows that factors affecting nitrate concentrations in the alluvium are numerous, and that long-term sampling is necessary to distinguish the oscillations caused by variability in the recharge intensity from decadelong trends controlled by the fertilizer load and nitrate lag time in the aquifer.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10503 - Water resources

Projekt

<a href="/cs/project/QJ1320213" target="_blank" >QJ1320213: Inovace systémů zemědělského hospodaření v prostředí kvartérních sedimentů, jejich ověření a aplikace v ochranných pásmech vodních zdrojů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Hydrogeology Journal

ISSN

1431-2174

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

16

Strana od-do

195-210

Kód UT WoS článku

000458520300013

EID výsledku v databázi Scopus

2-s2.0-85053198399