Word list

Wöter Liste in Fachgebiet oder Bericht.

Bericht

Deutsch

English

First and foremost,

Nonstationarity can lead to an optimal parameter set for one period which may not accurately simulate another.

Peaks of actual evapotranspiration for this watershed also shifted from April to May due to different arameter values depending on the calibration period’s winter air temperatures.

It is imperative that calibration and validation time periods are chosen selectively instead of arbitrarily

the goals of the study

It is also crucial that the hydrologic modelling community improves existing calibration and validation practices

commonly

It is therefore important that these models reliably represent historical observations within the bounds of heir uncertainty, as this gives confidence to model users and decision makers

out of bounds, beyound the bounds of

an arbitrary division of the data time series into two subsets

However, there are a wide variety of ways to split data

without justification

Nonstationarity can also affect hydrologic model outputs by making model processes

identify different responses to nonstationarity

computationally

The parameterization of a model, as well as the ability to identify optimal parameter values,

albeit there is still much to learn about building models and parameterizations aimed to account for nonstationarity in system processes.

albeit = although

and studies rarely explain why a particular data splitting

Unless specifically focused on model calibration

this consideration is frequently overlooked

split-sample is a classical approach to select calibration

when the calibration and validation data exhibit high autocorrelation

Since then, various other guidelines have been suggested

However, the impacts of nonstationarity on other water balance components besides the main output (e.g., streamflow) are typically not assessed.

the influence of initial parameter

This work uses XXX

XXX is widely used for hydrological simulations

For instance = z.B.

A can broadly affect B

These differences occurred throughout the water balance, including snowmelt

Researchers interested only in streamflow outputs could argue that adequate simulation of other water balance components is not integral to their studies.

water balance simulations are properly considered

the unmeasured water balance components should be aware of how much they can be affected by calibration

This highlights the importance of careful calibration period choice

Result / Ergebnis

Deutsch

English

Results were then aggregated to monthly means for comparisons.

We found that the selection of calibration and validation periods with the temporal split-sample approach can affect the sample size and distributions of observed streamflow data for calibration and validation groups

The cause for this was due to differences in groundwater flow

This research shows that

Model Modell

Deutsch

English

Model development,

calibration

optimization approach

validation

Calibration and validation were performed with the evolutionary algorithm AMALGAM

performance measure: NSE, KGE, dr

time periods

arbitrarily

responses

which impaired the ability for models

procedure

reliably represent historical observations within the bounds of heir uncertainty

long-term historical dataset

sufficient knowledge

Additional benefits include better assessment of model processes and improved communication and coordination of modelling practices

other components of the water balance

Historical observed data are allocated into calibration and validation groups as part of calibration and validation procedures

temporally

The simplest approach for selecting

parallel processing

Boden / Moore

Deutsch

speisen, Torfkörper wird nicht vom GW gespeist.

English

Data bearbeiten / Forschungsbebiet / Study area

Deutsch

English

sliding window

cross-validation

autocorrelation

We performed our assessment on three watersheds