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Fieldwork 2017 FIELDWORK 2017 CIE5318 Fieldwork Hydraulic Engineering December 2017 PREFACE As part of the Master program at the Delft University of Technology, an opportunity was provided to the students to take the course CIE5318 (Fieldwork Hydraulic Engineering). During the fieldwork we, as civil engineers, experienced the connection with the ideal theoretical study environment and the unpredictable practical real-life situation. The near winter conditions of the Black sea have shown us that measurements are not always as simple as they look. The famous saying: “measuring is knowledge” captures the essence of the trip, in which careless assumptions can lead to false precision or large uncertainty. The result of this process and cooperation is presented in this report. Our appreciation goes out to H.J. Verhagen and M. Voorendt for organizing the trip to Varna and supporting the group during the fieldwork. We also would like to thank ir. Boyan Savov and his wife Tsanka Savov for their help, support and highly skilled tips. The information concerning the local characteristics and general knowledge of measurements have proven very valuable. Thanks to the four architectural students of Free University Varna, who participated in the course, for their cooperation in the fieldwork measurement activities. We would like to thank Svasek for their contribution to the fieldwork data collection. Their metrological and wave data provided us with the tools to validate the measured data. Alejandra Ares Danny Janssen Thom Olsthoorn Daan Bader Igor Koevoets Floris Sijbesma Vassia Dagalaki Vasio Kralli Alexia Sotiriadou Koos Dijkhuis Teni Maroudi Sebastiaan Woerlee Maria Georgiou Lina Nikolaidou Xenofon Grigoris Ioanna Saxoni SUMMARY This report is the result of the Fieldwork Hydraulic Engineering of 2017. The course has been performed for the past 15 years in St. Konstantine, a resort in the coastal area of Varna city, Bulgaria. The objective of this year’s fieldwork can be summarised to the following: Plan and conduct a measuring campaign in order to collect sufficient data and assess last year’s design solution for this coastal area. Within this report many references are made to previous years. A short summary is given, structured in accordance with the topics in this report (beach, soil sampling, bathymetry, marina, groyne and breakwater), incorporating data collection and feasibility analysis for the topics considered. During the fieldwork, the elevations at different points at both the north and the south beach were measured, in order to determine those beaches’ cross sections and the change in the volume of sand (accretion or erosion) compared with last year. The raw data was processed and the new contours, as well as the net result of the nearshore processes at those beaches was determined. Soil samples were solely taken from the Southern Beach from the land onshore as well as from the bed offshore. A first estimation of the mean grain size is obtained by using a sand ruler. After transportation to Delft, the nominal diameter of the South beach sand, calcium content and other characteristics were determined in the laboratory. Within this report the groyne structure situated norther of the north beach is investigated. The objective is to assess the current state of the structure with both visual and in situ methods. The data collected were used in comparison with the relevant data from previous years in order to recreate the evolution of the structure through the years and assess the deteriorating process initiated by the local weather conditions. Based on these results suggestions on the incorporation of the groyne within the general rehabilitation plan were made. Wave conditions, bathymetric survey and inventory list of materials were calculated and checked in order to assess the Marina design in relation to the existing design that was presented in the last year’s report. This was done by ensuring that the wave penetration inside marina can be considered minimum and safe navigation will exist. The phenomena of reflection and diffraction were assessed by using wave data from Svasek hydraulics. Concerning the bathymetric survey, the water depth inside the marina was measured with the help of an echo sounder with GPS in order to assess if the required depth for navigation was reached and possible dredging that may be needed. Last but not least, the available materials in the area were determined and can be reused for the construction of several structures inside marina. Additionally, wave measurements corresponding to winter conditions were taken using different methods (visual observations, Svasek forecast, wave loggers). They were afterwards processed to derive the significant wave height which is used for the feasibility study and further checks to improve the design of the breakwater. Regarding the breakwater itself, its dimensions were measured and a report of its status was made (material inventory and current condition assessment). All the above provided the necessary data to perform the feasibility study on last year’s design and based on its deficiencies to compute and propose an improved breakwater design that in in accordance with the client’s wishes. Table of Contents PREFACE ................................................................................................................................................ 3 SUMMARY .............................................................................................................................................. 4 INTRODUCTION .............................................................................................................................. 7 1.1. Background ........................................................................................................................ 7 1.2. Problem definition .............................................................................................................. 8 1.3. Objective ............................................................................................................................ 8 1.4. Reading guide .................................................................................................................... 8 CONCEPT DESIGN 2016 ................................................................................................................ 9 2.1. Design requirements .......................................................................................................... 9 2.2. Design aspects ................................................................................................................ 10 DATA INVENTORY ....................................................................................................................... 14 3.1. What kind of data? ........................................................................................................... 14 3.2. Data and accuracies ........................................................................................................ 14 3.3. Variables .......................................................................................................................... 15 MEASURING METHODS .............................................................................................................. 16 4.1. Beach ............................................................................................................................... 16 4.1.1. Equipment ........................................................................................................................ 16 4.1.2. Dolphin new level (DNL) .................................................................................................. 17 4.1.3. South beach ..................................................................................................................... 18 4.1.4. North beach ..................................................................................................................... 21 4.1.5. Shoreline measurements ................................................................................................. 23 4.2. Soil sampling .................................................................................................................... 25 4.2.1. Location and depth of the soil samples ........................................................................... 25 4.2.2. Extraction of soil samples ................................................................................................ 25 4.2.3. First estimation of grain size using sand ruler ................................................................. 26 4.2.4. Packing and transport of soil samples ............................................................................. 28 4.2.5. Preparing soil samples for sieve analysis ........................................................................ 28 4.2.6. Sieve Analysis .................................................................................................................. 28 4.3. Bathymetry ....................................................................................................................... 31 4.4. Groyne ............................................................................................................................. 32 4.4.1. Height/slope measurement .............................................................................................. 32 4.4.2. Damage Assessment ......................................................................................................
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