-
opment of multiple regression equations for estimating the index flood. For this reason, simple
regression models were developed by combining several variables together into one single ex-
planatory variable. Results were considerably improved compared to those obtained with one
single variable such as the drainage area for instance, but the limited number of gauged sites can
still be an obstacle
/media/vedurstofan/utgafa/skyrslur/2014/VI_2014_001.pdf
A power-form equation is often used:
bµi(D) = q0C
q1
i;1C
q2
i;2::::C
qk
i;k:::C
qn
i;n: (3)
where qk denotes the vector of model parameters. Multiple linear regression is used to infer the
model parameters after logarithm transformation (see for instance Grover et al., 2002), using
available information at gauged sites.
When too few gauged sites are available to develop Eq. (3), simple linear
/media/vedurstofan/utgafa/skyrslur/2015/VI_2015_007.pdf
models to very simple tools and expert judgements. The
uncertainties here are related to data and models and, very importantly, to the assumptions
on future pressures and other external conditions. The model uncertainty includes elements
of the natural system (e.g. related to water quality and ecosystem processes), the technical
system (e.g. which technological development will occur) and the social
/media/loftslag/VanderKeur_etal-2008-Uncertainty_IWRM-WARM.pdf
2007]. The two-layer
method is a relatively simple water balance method for
calculating actual evapotranspiration and groundwater re-
charge. The controlling parameter is the root zone capacity,
defined as the difference between water content at field
capacity and wilting point, multiplied by the depth of the
root zone. The higher the root zone capacity, the higher the
fraction of infiltrating
/media/loftslag/vanRoosmalen_etal-2009-WRR_2007WR006760.pdf
managing risks and delivering the means to achieve change.
If mistrust in institutions is indeed a determining factor inhibiting public support
for mitigation efforts, as some of the data presented in this paper suggest, one
option to increase uptake of mitigation actions would be to seek to increase trust.
However, the extensive literature on trust shows that such a strategy may not be
as simple/media/loftslag/Lorenzoni_Pidgeon_2006.pdf
the return level r associated with the
return period 1/p can be estimated with the formula:
= �
− �1 −
{−(1 − )}−� , ≠ 0
− {−(1 − )}, = 0
Furthermore, r is defined as the value expected to be exceeded on average once every 1/p year.
The Block Maxima approach is a simple method
/media/vedurstofan-utgafa-2020/VI_2020_008.pdf
optimized but several tests
were performed. The idea here was to keep the method as simple and quick as possible, by
focusing on the atmospheric circulation patterns only and their influence on precipitation
and temperature and therefore runoff, through their associated wind regime. With this
method, selected analogues are the same for all catchments.
- Method 2: each day, the N best analogues
/media/vedurstofan/utgafa/skyrslur/2013/VI_2013_008.pdf