Overview

A project to stabilise sand movement and cliff erosion at Mount Martha North beach, on the Mornington Peninsula, is underway. Beach and cliff erosion occurs at Mount Martha North due to ongoing, natural processes.

Several actions have been taken to limit the adverse effects of erosion on Mount Martha North beach in the short to medium term, with the most recent being emergency works carried out between August and October 2018 to address immediate safety concerns.

DELWP commissioned a technical study in 2017 to help determine the best possible engineering solutions to stabilise sand loss from the beach area.

To ensure that community values regarding Mount Martha North beach are considered in the study, we are now inviting beach users to complete a brief survey.

Context

Mount Martha North beach is located on the eastern side of Port Phillip Bay and runs approximately 600 metres from the mouth of Balcombe Creek at the southern end, to a headland separating it from Hawker Beach, to the north.

Please refer to the map in the Document Library section on the right hand side of the screen for more details.

Sand loss at Mount Martha North beach is part of an ongoing natural process. Winter weather conditions generally move sand to the south, and summer weather moves some sand back to the north. Overall, there is a net loss of sand from Mount Martha North beach towards the Mount Martha South beach.

Recognising that the coastal process of sand movement will always occur, the primary objectives for DELWP are to maintain public safety for the Mount Martha North beach and protect the natural assets and public infrastructure.
Moutn Martha North beach looking south on a calm day. Includes view of beachboxes backing onto cliffs, with water at base. Some sand reamins on the beach.

Mount Martha North beach

Multi-criteria analysis

DELWP has engaged coastal engineering consultants Water Technology to carry out a multi-criteria analysis of four engineering options that were recommended in a 2017 coastal processes study, aimed at slowing sand loss from the beach.

The full coastal processes study may be viewed in the Document Library section on the right hand side of the screen.

The following criteria will be applied in assessing each engineering option:

  • environmental (impacts and benefits)
  • financial (life-cycle cost)
  • social
  • technical
  • upfront (construction) cost.

The multi-criteria analysis will score and rank each option, and up to two of the highest ranked options will then be modelled in detail. The modelling will develop and test the options to determine what scale, design and positioning would be required for the preferred engineering works to stabilise Mount Martha North beach. This modelling will inform the short and long-term management of Mount Martha North beach and cliff.

Consideration will also be given to safety and future adaptability of the solutions as the climate changes.

Please refer to the timeline on the right-hand side of the screen for next steps regarding actions related to Mount Martha North beach.

Current protective works and planning at Mount Martha North beach

Alongside the multi-criteria analysis for engineering options to stabilise sand movement at the beach, DELWP is undertaking additional works and studies as follows:

  • Emergency works to stabilise the eroding cliff-face through installation of an emergency rock revetment: completed October 2018
  • Geotechnical monitoring of cliff movement and emergency revetment: installed December 2018
  • Permanent revetment detailed design – completed November 2018: decision regarding installation pending monitoring results for emergency revetment
  • Cultural Heritage Management Plan (CHMP): Underway. Delivery expected early 2019

How will survey information be used?

We will use survey results to assist in developing weightings that reflect community values, relating to the four options under consideration. In particular, the survey will influence the social and environmental criteria of the analysis. This is a qualitative survey, to give us a better understanding of community use of Mt Martha North beach - participants are not being asked to vote on specific options.

Tell us what you value at Mount Martha North beach

We want to understand what you value at Mount Martha North Beach to help us determine the best option to manage erosion and future beach use.

The following survey will take around 10 minutes to complete.

Section 1: Beach Use

This section will help to inform us about how people use the Mount Martha North beach.

1.1 How many times have you visited Mount Martha North beach in the last month?
1.2 How many times have you visited Mount Martha North beach in the last 6 months?
1.3 How often did you visit Mount Martha North beach last summer?
1.4 Mount Martha North beach has recently been closed. Did this affect your beach useage patterns?
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1.5 Do you visit other beaches on the Mornington Peninsula?
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Section 2: Beach activity

This section will inform us about what activities take place on the beach. This will assist in comparing different management options and how they may affect use of the beach.

2.1 Thinking about your most recent visit to Mount Martha North beach, what was your primary activity?

WINTER ACTIVITY: For the following activities, please select the most appropriate frequency, regarding your use of Mount Martha North beach over winter ...

SUMMER ACTIVITY: For the following activities, please select the most appropriate frequency, regarding your use of Mount Martha North beach over summer ...

2.2 Do you walk between the north and south beaches? Please add comments if this changes due to factors such as the weather, beach access etc.

Section 3: Beach Access

This section will help inform us about how people are accessing Mount Martha North beach. There are a number of access points and coastal erosion management options may impact access routes, so it is important to understand how you access the beach.

3.1 How did you access Mount Martha North beach on your last visit?
3.2 How do you normally access Moutn Martha North beach?
3.3 How did you access the beach precinct on your last visit?
3.4 How do you normally access the beach precinct?
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Section 4: Coastal processes and coastal structures

Studies, confirmed by recent summers and winters, have shown that Mount Martha North beach, like all beaches in Port Phillip Bay, is subject to seasonal fluctuation in the volume of sand which makes the beach. During winter, storms pull sand from the beach and push it towards Mount Martha South. During summer, more gentle conditions push this material back towards Mount Martha North beach and the beach slowly increases in width and height. Without intervention, this movement will continue, with a net loss of sand towards the south. Some winters may not remove all of the sand on the beach, but in general, the trend for Mount Martha North beach is that the beach will reduce in size and may disappear completely in winter without beach protection structures.

The following link to the Document Library provides examples for different options relevant to Section 4 ... Coastal options examples

We are interested in what you think the beach should be. Please indicate your level of agreement with the following statements.

During some winters I accept that there may not be a beach at Mount Martha North that I can access due to lack of sand or hazardous conditions.

(note: the protection of the toe of the cliff will remain as this is protecting The Esplanade and services above the cliff.)

I accept that this sand may be washed away immediately or may last several years, depending on storms and environmental conditions.

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Section 5: About you

This section will assist in understanding the demographics of beach users. The information will be used to provide information on beach users and what they value for the Mount Martha North Beach multi-criteria analysis.

5.1 What is your age?

5.2 What is the postcode of your primary residence?

5.3 How far is your primary residence from Mount Martha North beach?
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5.5 Do you have access to a beach box on MMN beach (through shared / family ownership / friendships etc)?
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This information will be de-identified from your responses.

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Privacy

The Department of Environment, Land, Water and Planning (DELWP) is committed to protecting personal information provided by you in accordance with the principles of the Victorian privacy laws.

The information you provide will be used to help inform the Mount Martha North beach project, and to keep you updated on the project if you choose to provide contact details.

The information you provide will be made available to DELWP to help inform the future management of Mount Martha North beach only. Personal details (name/contact details) will not be made public.

You may access the information you have provided to DELWP by contacting Cass Philippou at cass.philippou@delwp.vic.gov.au.