Unit:
Department of Geology and GeoenvirommentLibrary of the School of Science
Author:
TSILIKIS-POLYZOIDIS IOANNIS
CHATZOPOULOU DIMITRA
Supervisors info:
Σκυλοδήμου Χαρίκλεια Δ., Ε.ΔΙ.Π, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
Original Title:
Χαρτογράφηση επιφανειακού υδρογραφικού δικτύου και εκτίμηση πλημμυρικού κινδύνου στην ευρύτερη περιοχή της Νέας Μάκρης, Ανατολική Αττική
Translated title:
Stream network mapping and flood hazard assessment in the region of Nea Makri, East Attica
Summary:
Floods are considered to be an international phenomenon of great danger. They
occur when intense rainfalls cause rapid ascent of the water, in short amount of
time. Although a flood is a natural part of the Water Cycle, it has also proven to be
catastrophic for catastrophic for the human civilization.
The study area of this thesis is the region of Nea Makri and Anatoli. The streams that
are being studied are: the stream of Karlantera, the stream of St Efraim, the stream
of Xilokeriza, the stream of Anatoli and the stream of Rockfeller. The entire stream
network of this area has seasonal flow. This thesis has two distinct goals: the
mapping, the analysis and the depiction of the stream network and the evaluation of
flood hazard in the study area.
The methodology of mapping the stream network includes the use of topographic
maps with scale of 1:5000 and 1:25000 of the Military Geographic Service, field
observations and their photo material, with simultaneous use of GPS. The map of
flood hazard of the study area has been created with the help of Geographic
Information Systems (GIS). Five different factors have been taken into consideration
for the assessment of the flood hazard: the altitudes, the slopes, the land use of the
study area, the permeability of the geological formations and the buffer zones
around the floodplains of the streams. The factors have been calibrated with a single
numerical scale, they were correlated, and, through their sum, the flood hazard map
has arisen.
The result analysis showed that all the streams that are being studied, flow through
drainage pipes, except for the stream of Anatoli, in which case the mouth is covered
by urban area. From the total length of all floodplains, 35% has its floodplain covered
or semi-covered. The area has been divided into gradated hazard levels and “High
risk” and “Very high risk” zones of flood hazard are being observed around low
altitudes, where urban area is located and the floodplains of the stream are covered.
The percentage of those zones covers 24% of the total study area. The human
intervention also plays a big part in the increased risk for flood, because the human
infrastructures are blocking the natural flow of the streams.
Main subject category:
Science
Keywords:
Geographic, Information, Systems, Evaluation, Assessment, Flood, Floods, Hazard, Danger, Mapping, Stream Network, East, Attica, Nea Makri
