Environmental Engineering Reference
In-Depth Information
CHAPTER 6
Impacts of Node Connectivity on
The research presented in this chapter analyses impacts of node connectivity on network
reliability by comparing two approaches: a simplified one, which evaluates connectivity in
relative terms by taking into consideration two most dominant node categories (in three
different ways), and the other one that is based on graph theory. The results of the first
approach have been processed by the
network diagnostics tool
(NDT), while NodeXL, an MS
Excel add-on template in public domain, has been used for the second approach. Several
hydraulic simulations have been conducted on various sets of networks partly generated by
the tool discussed in Chapter 4, with fixed or variable pipe diameters and demands. The
mutual correlation of the connectivity measures has been analysed, and compared separately
for each approach with the reliability measures discussed in Chapter 5, namely the
ADF
avg
,
NBI
and
I
n
. The results processed statistically by the Spearman test show limited correlations
existing mostly in those layouts that vary significantly in the degree of complexity. This
points the fact that node connectivity can hardly be analysed independently from other
network parameters, although the concept of network connectivity index as a parameter of
more complex reliability formula is recommended for further research.
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