Application of Hyperspectral Remote Sensing for Monitoring Eutrophication Indicators in the Adriatic Sea Coastal Zones and Inland Waters
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Academic Interdisciplinary Postgraduate Doctoral Study “Environmental Management“ Mak Kišević APPLICATION OF HYPERSPECTRAL REMOTE SENSING FOR MONITORING EUTROPHICATION INDICATORS IN THE ADRIATIC SEA COASTAL ZONES AND INLAND WATERS DOCTORAL THESIS Supervisors: Prof. Roko Andričević, PhD Mira Morović, PhD Zagreb, 2015 i Sveučilišni, interdisciplinarni, poslijediplomski, doktorski studij "Upravljanje okolišem" Mak Kišević PRIMJENA HIPERSPEKTRALNE DALJINSKE DETEKCIJE ZA PRAĆENJE INDIKATORA EUTROFIKACIJE U PRIOBALNIM PODRUČJIMA JADRANSKOG MORA I U KOPNENIM VODAMA DOKTORSKI RAD Mentori: Prof.dr.sc. Roko Andričević Dr.sc. Mira Morović Zagreb, 2015 ii Mariji ljepote punoj Ljiljani i Bruni iii Acknowledgements I am very grateful to my supervisors prof. Roko Andričević, PhD and Mira Morović, PhD for providing valuable feedback and guiding my research towards the doctoral thesis that you have in front of you. My gratefulness extends to Amer Smailbegović, PhD who introduced me to the basics of collecting and analysing hyperspectral data and provided help and friendship in numerous occasions. This research would be impossible without the good people from the Institute of Oceanography and Fisheries in Split and the Agricultural Faculty at the University of Zagreb who generously provided me with some of the equipment that I used for collecting data. Živana Ninčević, PhD, provided Chlorophyll data for the model validation, Ante Žuljević, PhD provided location guidance for collecting Caulerpa samples, prof. Ivica Kisić, PhD let me use field spectrometer from his laboratory. My fellow students and scuba divers Dajana Brajčić and Ivana Dragičević helped in collecting samples of subaquatic vegetation and Lea Levi and Vedran Petrov helped in collecting data in the Kaštela Bay and River Sava. I would also like to thank for the grant received from the “Alexandar Goetz Instrument Support Program” which provided us with the field spectrometer. The special thank you goes to professor Gia Destouni, PhD and the Swedish Research Council for supporting part of the research on the River Sava regarding the use of hyperspectral data for complementing the monitoring of nutrient dynamics. I am also expressing my gratitude to the company Eco- Logic Systems and to its owner Mark Gero who covered part of my scholarship at the postgraduate studies. Finally, I would like to thank prof. Natalija Koprivanac, PhD, prof. Tarzan Legović, PhD and prof. Roko Andričević, PhD for their efforts in organising an excellent postgraduate programme that has been a valuable stepping stone in my research and professional development. iv Table of Contents 1! INTRODUCTION .............................................................................................................. 1! 1.1! Problem setting ................................................................................................................ 1! 1.2! Research objective ........................................................................................................... 3! 1.3! Research questions .......................................................................................................... 3! 1.4! Hypothesis ........................................................................................................................ 4! 1.5! Scientific Contribution .................................................................................................... 4! 1.6! Structure of the thesis ..................................................................................................... 5! 2! EUTROPHICATION ........................................................................................................ 7! 2.1! Eutrophication processes and its consequences ........................................................... 7! 2.2! Sources of eutrophication ............................................................................................... 9! 2.3! Coastal and inland waters .............................................................................................. 9! 2.4! Eutrophication assessment ........................................................................................... 11! 2.5! Invasive species as indicators of eutrophication ......................................................... 13! 3! THEORETICAL BACKGROUND ................................................................................ 15! 3.1! Basics of remote sensing ............................................................................................... 15! 3.2! Remote sensing of water quality .................................................................................. 17! 3.2.1! Atmosphere .................................................................................................................. 21! 3.2.2! Air-water interface ....................................................................................................... 22! 3.2.3! Bottom effect ................................................................................................................ 22! 3.2.4! Adjacency effect ........................................................................................................... 22! 3.3! Inherent optical properties of water ............................................................................ 23! 3.4! Optically measurable water constituents .................................................................... 24! 3.4.1! Pure water ..................................................................................................................... 24! 3.4.2! Phytoplankton .............................................................................................................. 24! 3.4.3! Colored dissolved organic matter ................................................................................. 25! 3.4.4! Suspended inorganic matter ......................................................................................... 25! 3.4.5! Other optically measurable water quality parameters .................................................. 26! 4! REVIEW OF CURRENT RESEARCH ADVANCEMENTS ..................................... 27! 4.1! Algorithms for water quality ........................................................................................ 27! v 4.1.1! Chlorophyll a ................................................................................................................ 27! 4.1.2! TSS ............................................................................................................................... 29! 4.1.3! Turbidity ....................................................................................................................... 30! 4.2! Satellite remote sensing of water quality ..................................................................... 34! 4.3! Remote sensing of invasive species .............................................................................. 42! 4.4! Application of remote sensing products in eutrophication assessment .................... 44! 5! MATERIALS AND METHODS .................................................................................... 46! 5.1! Description of research area ......................................................................................... 46! 5.1.1! Kaštela Bay .................................................................................................................. 46! 5.1.2! Sava River .................................................................................................................... 46! 5.1.3! Island of Hvar ............................................................................................................... 47! 5.2! Data collection ............................................................................................................... 47! 5.2.1! Kaštela Bay .................................................................................................................. 47! 5.2.2! Sava River .................................................................................................................... 49! 5.2.3! Invasive subaquatic vegetation ..................................................................................... 53! 5.3! In-situ data pre-processing ........................................................................................... 54! 5.4! Empirical estimation of water quality parameters .................................................... 54! 5.4.1! Establishing correlations between optical and water quality data ................................ 54! 5.4.2! Algorithm development ................................................................................................ 55! 5.4.3! Accuracy ....................................................................................................................... 56! 5.5! Image classification ....................................................................................................... 57! 5.5.1! Image pre-processing ................................................................................................... 57! 5.5.2! Georectification ............................................................................................................ 57! 5.5.3! Removal of atmospheric effects ................................................................................... 58! 5.5.4! Generating prediction maps ......................................................................................... 58! 6! RESULTS .........................................................................................................................