Details
| Translated title of the contribution | Trends in streamflow observation series in Lower Saxony |
|---|---|
| Original language | German |
| Pages (from-to) | 196-205 |
| Number of pages | 10 |
| Journal | Hydrologie und Wasserbewirtschaftung |
| Volume | 57 |
| Issue number | 5 |
| Publication status | Published - Oct 2013 |
Abstract
Observations of low-flow, medium-flow, and high-flow situations in rivers in the German Federal State of Lower Saxony were analyzed for trends. Two periods were selected, namely the years from 1951 to 2005 with sufficiently long records of mean daily flows from 34 gauging stations and from 1966 to 2005 with data from 110 gauges. Of these time series indices were derived that characterize both the extremes and the mean values of the flows within one year or one season and were subjected to trend analyses. Beyond the river-discharge data, temperature and precipitation indices were tested for trends in order to identify possible causal relations. Here the time frame chosen for the analysis was from 1951 to 2005, with data from 18 temperature stations and 263 precipitation stations. The largest, often significant changes were observed in summer, when all indices suggest reductions in floodflows, mean flows, and low flows. This applies especially to the eastern part of Lower Saxony. Striking was the large number of breakpoints detected in the summer flows in 1988, indicating a trend reversal after 1988. In spring and in autumn, a differentiation between an increase in the north-west and a decrease in the south-east was observed within the low-flow series. In winter, merely some upward trends in the floodflow indices proved to be field significant. Generally, the trends in river discharges are consistent with those in temperature and precipitation. In the mean temperature, consistently significant strong-positive trends were detected, while the analysis of the precipitation indices revealed increases in winter and decreases in summer.
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Hydrologie und Wasserbewirtschaftung, Vol. 57, No. 5, 10.2013, p. 196-205.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Trends in beobachteten abflusszeitreihen in Niedersachsen
AU - Fangmann, Anne
AU - Belli, Aslan
AU - Haberlandt, Uwe
PY - 2013/10
Y1 - 2013/10
N2 - Observations of low-flow, medium-flow, and high-flow situations in rivers in the German Federal State of Lower Saxony were analyzed for trends. Two periods were selected, namely the years from 1951 to 2005 with sufficiently long records of mean daily flows from 34 gauging stations and from 1966 to 2005 with data from 110 gauges. Of these time series indices were derived that characterize both the extremes and the mean values of the flows within one year or one season and were subjected to trend analyses. Beyond the river-discharge data, temperature and precipitation indices were tested for trends in order to identify possible causal relations. Here the time frame chosen for the analysis was from 1951 to 2005, with data from 18 temperature stations and 263 precipitation stations. The largest, often significant changes were observed in summer, when all indices suggest reductions in floodflows, mean flows, and low flows. This applies especially to the eastern part of Lower Saxony. Striking was the large number of breakpoints detected in the summer flows in 1988, indicating a trend reversal after 1988. In spring and in autumn, a differentiation between an increase in the north-west and a decrease in the south-east was observed within the low-flow series. In winter, merely some upward trends in the floodflow indices proved to be field significant. Generally, the trends in river discharges are consistent with those in temperature and precipitation. In the mean temperature, consistently significant strong-positive trends were detected, while the analysis of the precipitation indices revealed increases in winter and decreases in summer.
AB - Observations of low-flow, medium-flow, and high-flow situations in rivers in the German Federal State of Lower Saxony were analyzed for trends. Two periods were selected, namely the years from 1951 to 2005 with sufficiently long records of mean daily flows from 34 gauging stations and from 1966 to 2005 with data from 110 gauges. Of these time series indices were derived that characterize both the extremes and the mean values of the flows within one year or one season and were subjected to trend analyses. Beyond the river-discharge data, temperature and precipitation indices were tested for trends in order to identify possible causal relations. Here the time frame chosen for the analysis was from 1951 to 2005, with data from 18 temperature stations and 263 precipitation stations. The largest, often significant changes were observed in summer, when all indices suggest reductions in floodflows, mean flows, and low flows. This applies especially to the eastern part of Lower Saxony. Striking was the large number of breakpoints detected in the summer flows in 1988, indicating a trend reversal after 1988. In spring and in autumn, a differentiation between an increase in the north-west and a decrease in the south-east was observed within the low-flow series. In winter, merely some upward trends in the floodflow indices proved to be field significant. Generally, the trends in river discharges are consistent with those in temperature and precipitation. In the mean temperature, consistently significant strong-positive trends were detected, while the analysis of the precipitation indices revealed increases in winter and decreases in summer.
KW - Flood flow
KW - Low flow
KW - Lower Saxony
KW - Streamflow
KW - Trend analysis
UR - http://www.scopus.com/inward/record.url?scp=84894132006&partnerID=8YFLogxK
U2 - 10.5675/HyWa-2013,5-1
DO - 10.5675/HyWa-2013,5-1
M3 - Artikel
AN - SCOPUS:84894132006
VL - 57
SP - 196
EP - 205
JO - Hydrologie und Wasserbewirtschaftung
JF - Hydrologie und Wasserbewirtschaftung
SN - 1439-1783
IS - 5
ER -