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Project part-financed by the European Union (European Regional Development Fund)

The Interreg IVB North Sea Region Programme


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Management measures analysis and comparison

Authors:

by S. Saathoff, J. Knüppel, S. Manson & A. Boerema



3a. Measure collection and compilation of basic information

The first working step consisted of collecting basic information on a set of chosen measures from the four TIDE estuaries. The measure compilation took place based on a measure category list structuring the range of possible development targets and therefore assuring a systematic compilation of examples (Table 2). The choice of examples to be included in the study (Table 4) was left to the respective TIDE estuary representative of the TWG (Table 1) provided that the examples were judged as well documented (e.g. by available monitoring results or modelling results) and educative in view of potential future measure planning and implementation processes.

Table 2: Measure categories and assigned development targets
Measure category Development target
Biology/Ecology Measure to develop and/or to protect specific habitats
Measure to develop and/or to protect specific species
Other measure to develop natural gradients and processes, transition and connection
Measure to prevent introduction of or to fight invasive species
Hydrology/Morphology Measure to reduce tidal energy, tidal range, tidal asymmetry and tidal pumping effects
Measure for flood protection
Measure to improve morphological conditions
Measure to decrease the need for dredging
Physical/Chemical Quality Measure to reduce pollutant loading (point and diffuse sources)
Measure to reduce nutrient loading (point and diffuse sources)
Measure to improve oxygen conditions
Measure to reduce physical loading (e.g. heat input by cooling water entries)
Other measure to improve self-purifying power


As a preparatory step of the subsequent measure analysis, a survey requesting fundamental and extended information on the selection of measure examples was developed and filled in by the members of the TWG (Table 3).

Table 3: Overview on fundamental and extended information requested in measure surveys
Fundamental information Description of measure
Location of measure
Status of measure
Legislative assignment of measure
Cost estimation
Extended information Monitoring
Initial assessment of effectiveness and sustainability
Assessment of conflict potential and synergistic effects
Site selection criteria
Lessons learned
Additional materials


Table 4: List of measure examples and reference
1 Elbe Spadenlander Busch/Kreetsand HPA (2012a)
2 Elbe Underwater relocation area ‘Medemrinne Ost‘ HPA (2012b)
3 Elbe Current deflection wall ‘Köhlfleet‘ HPA (2012c)
4 Elbe Study on ´Investigation on freshwater current direction control at Bunthaus and possible impact on sedimentation patterns in the Port of Hamburg´ HPA (2012d)
5 Elbe Sediment-Trap near Wedel HPA (2012e)
6 Elbe Compensation channel ‘Hahnöfer Nebenelbe’ HPA (2012f)
7 Elbe Realignment Wrauster Bogen HPA (2012g)
8 Elbe Compensation measure Hahnöfer Sand (2002) HPA (2012h)
9 Elbe Spadenländer Spitze HPA (2012i)
10 Elbe Settlement of reed at the harbour location ´Haken´ HPA (2012j)
11 Elbe Land treatment of dredged material including MEchanical Treatment and Dewatering of HArbour-sediments (METHA) HPA (2012k)
12 Elbe Managing the ´Reiherstieg´ sluice to improve oxygen conditions HPA (2012l)
13 Scheldt Lippenbroek - flood control area with controlled reduced tide (FCA-CRT) APA (2012a)
14 Scheldt Groynes at Waarde APA (2012b)
15 Scheldt Ketenisse wetland - small scale tidal wetland restoration in the brackish part of the estuary APA (2012c)
16 Scheldt Paddebeek wetland- small scale tidal wetland restoration in the freshwater zone of the Seascheldt APA (2012d)
17 Scheldt Paardenschor- small scale brackish tidal wetland restoration in the Seascheldt APA (2012e)
18 Scheldt Heusden LO -small scale tidal wetland restoration in the freshwater zone of the Seascheldt APA (2012f)
19 Scheldt Schelde pilot project 2: Relocation of dredged sediment to deep areas of the navigation channel APA (2012g)
20 Scheldt TIDE pilot: Relocation of dredged sediment to a shallow water area at the edge of the Walsoorden sandbar (2004) APA (2012h)
21 Scheldt TIDE pilot: Relocation of dredged sediment to a shallow water area at the edge of the Walsoorden sandbar (2006) APA (2012i)
22 Scheldt TIDE pilot: Relocation of dredged sediment to four shallow water areas at the edge of sandbars (2010) APA (2012j)
23 Scheldt Vispaaiplaats – Fish spawning pond APA (2012k)
24 Weser Tegeler Plate- Development of tidally influenced brackish water habitats Saathoff, S. ,M. Wernick. (2012)
25 Weser Shallow water area Rönnebecker Sand Saathoff , S. and J. Lange. 2012c
26 Weser Tidal habitat Vorder- und Hinterwerder Saathoff , S. and H. Klugkist. 2012
27 Weser Shallow water area Kleinensieler Plate Saathoff , S. and J. Lange. 2012b
28 Weser Cappel-Süder-Neufeld Saathoff , S. and J. Lange. 2012a
29 Weser TIDE pilot: Restoration of a dike foreland in Werderland – Feasibility study Saathoff , S. and D. Hürter. 2012
30 Humber Alkborough Managed Realignment and flood storage – Creation of ~440 a of intertidal habitat EA (2012a)
31 Humber Paull Holme Strays Managed Realignment – creation of ~80 ha of intertidal habitat EA (2012b)
32 Humber Hydromotion MudBug – determine the density of ‘fluid’ mud to determine the depth of the navigable channel (1250 kg/m³) EA (2012c)
33 Humber Creation of ~13 ha of intertidal habitat at Chowder Ness EA (2012d)
34 Humber Creation of ~54 ha of intertidal habitat at Welwick EA (2012e)
35 Humber Kilnsea Wetlands EA (2012f)
36 Humber South Humber Gateway Roosting Mitigation EA (2012g)
37 Humber Training walls Trentfalls EA (2012h)
38 Humber Donna Nook and Skeffling EA (2012i)
39 Humber Tunstall Realignment EA (2012j)



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Important to know

Reports / Measures / Tools

Report: Management measures analysis and comparison


Management issues

How and by which management measures can tidal amplification be reduced?
How can public acceptance for management actions be increased?
How can the Ecosystem Services Approach be used to support management decisions?
How can we assure accessibility to an inland estuarine port without affecting the habitats and safety against flooding?
How can we prevent excessive degradation or loss of tidal marshes?
How does habitat management affect the supply of ecosystem services?
What are the key areas of conflicts or synergies in TIDE estuaries?
What are the restoration opportunities for side branch systems and river banks (e.g. left side branch Weser)?
What factors determine the distribution of suspended sediments in an estuary?
What measures are successful for the dissipation of tidal energy?
What monitoring is required to support and assess management decisions?
What parameters should be used to define and evaluate measure targets?
What tool is available to help manage multiple users of a resource in an integrated way (i.e. achieving more holistic management)?
Which aspects do I have to take into account in order to make a measure a success?
Which measures are suitable to achieve specific ecological targets?
Which measures are suitable to achieve specific morphological and hydrological targets?
Which measures are suitable to identify, protect or develop valuable submerged habitats e.g. mussel beds and Sabellaria reefs?
Which measures are suitable to improve the physical characteristics and chemical water quality?
Which measures are suitable to provide ecosystem services and benefits?
Which synergistic effects and conflicts can be expected by planning and implementing a certain measure?
“Working with nature”: What are the opportunities for sediment management in estuaries?