What affects the hydrological response of rain-on-snow events in low-altitude mountain ranges in Central Europe?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10433221" target="_blank" >RIV/00216208:11310/21:10433221 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60460709:41330/21:85798

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rE-M8rf042" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rE-M8rf042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jhydrol.2021.127002" target="_blank" >10.1016/j.jhydrol.2021.127002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

What affects the hydrological response of rain-on-snow events in low-altitude mountain ranges in Central Europe?

Popis výsledku v původním jazyce

Rain-on-snow (ROS) events influence the hydrological regime of rivers in regions with seasonal snow cover. Although ROS events are often related to floods, they do not always cause severe runoff. During ROS, the snowpack has an ambiguous effect on runoff generation; it can either store a significant portion of rain or amplify runoff by additional snowmelt. There is a need to understand under what circumstances ROS events produce runoff. We analysed eleven years of hourly meteorological, snow water equivalent and streamflow data from 15 catchments located in two mountain ranges in Czechia. We identified 611 ROS events which were further analysed and classified using selected meteorological, snow and runoff indices. The analysis of the runoff response of all ROS events revealed that only 5% of them resulted in high runoff exceeding the 1-year return period, but most of the events (82%) did not cause any significant runoff increase. Employing self-organising maps enabled us to categorise the events and better understand what combination of hydrometeorological characteristics leads to various runoff responses. High volumes of rain together with low snow cover were identified as important factors in the generation of high runoffs. In contrast, a deep and extended snowpack affected by rain under low air temperatures usually caused lower runoffs. The results of this study showed the importance of the snowpack, which can often prevent extreme runoff even when a large amount of rainfall occurs. Understanding the hydrological regime of ROS is becoming even more important with the ongoing decline of the snowfall fraction and subsequent changes in snow storage.

Název v anglickém jazyce

What affects the hydrological response of rain-on-snow events in low-altitude mountain ranges in Central Europe?

Popis výsledku anglicky

Rain-on-snow (ROS) events influence the hydrological regime of rivers in regions with seasonal snow cover. Although ROS events are often related to floods, they do not always cause severe runoff. During ROS, the snowpack has an ambiguous effect on runoff generation; it can either store a significant portion of rain or amplify runoff by additional snowmelt. There is a need to understand under what circumstances ROS events produce runoff. We analysed eleven years of hourly meteorological, snow water equivalent and streamflow data from 15 catchments located in two mountain ranges in Czechia. We identified 611 ROS events which were further analysed and classified using selected meteorological, snow and runoff indices. The analysis of the runoff response of all ROS events revealed that only 5% of them resulted in high runoff exceeding the 1-year return period, but most of the events (82%) did not cause any significant runoff increase. Employing self-organising maps enabled us to categorise the events and better understand what combination of hydrometeorological characteristics leads to various runoff responses. High volumes of rain together with low snow cover were identified as important factors in the generation of high runoffs. In contrast, a deep and extended snowpack affected by rain under low air temperatures usually caused lower runoffs. The results of this study showed the importance of the snowpack, which can often prevent extreme runoff even when a large amount of rainfall occurs. Understanding the hydrological regime of ROS is becoming even more important with the ongoing decline of the snowfall fraction and subsequent changes in snow storage.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Hydrology

ISSN

0022-1694

e-ISSN

—

Svazek periodika

603

Číslo periodika v rámci svazku

Part C

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

127002

Kód UT WoS článku

000706336100002

EID výsledku v databázi Scopus

2-s2.0-85116925802