Chichester Harbour Conservancy 54 Table 12 Strategic and Local Gaps Related to the Margins of the Harbours
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CHICHESTER DISTRICT COUNCIL Wav ant BOROUGH COUNCIL u Portsmouth CITY COUNCIL BOROUGH FAREHAM COUNCIL GOSPORT BOROUGH COUNCIL f ENGLISH En v ir o n m e n t Ag e n c y NATURE East Solent Shoreline Management Plan Volume III The Harbours Report EX 3441 June 1997 DATE DUE W) I E n v i r o n m e n t A g e n c y NATIONAL LIBRARY & - INFORM ATION SERVICE . SOUTHERN REGION Guildbourne House, Chatsworth Road. W orthing. West Sussex BN 11 1LD Address and Registered Oflice: HR W allingford Ltd. Howbery Park. Wallingford. Oxon 0X10 8BA Tel: + 44 (0)1491 835381 Fax: + 44 (0)1491 832233 ENVIRONMENT AGENCY R e stored m England No 2562099 HR W»«ngtofd is a who»y ownad subsidary o< HR Walknglofd Group Ud 061860 Ea b SoleM Shoreline M»n»*emerw PUn V o lu m e III S i Preface The East Solent Shoreline Management Plan is presented in four volumes. This document is Volume III. It presents background information on coastal processes, existing management operations, the natural environment, land use and the human environment that is necessary in the formulation of management plans for the large natural harbours o f Chichester, Langstone and Portsmouth. The remaining three Volumes of the East Solent Shoreline Management Plan include: • the background management information for the open coast and Pagham Harbour (Volume I) • the coastal defence objectives, management units, preferred management options, recommended further studies and future review programme for the open coast (Volume II) • the coastal defence objectives, management approach, preferred management options, recommended further studies and future review programme for the harbours, including Pagham Harbour (Volume fV). Chichester District Council, acting on behalf of the East Solent Coastal Group, commissioned HR Wallingford to undertake the Shoreline Management Plan in accordance with the Consultant’s Brief and the Ministry of Agriculture, Fisheries and Food document “Shoreline Management Plans - A Guide for Coastal Defence Authorities”. The Steering Committee for the East Solent Group comprised: Mr D. Bell - Technical Services Department - Chichester District Council (Lead Authority) Mr A. Greenhouse and Mr P Willey - Planning and Development Department - Fareham Borough Council Mr M. Wheeler - Engineering Services - Gosport Borough Council Mr G. Lloyd - Engineering Services - Portsmouth City Council Mr M. Smith - Technical Services - Havant Borough Council Mr C. Harding - Environment Agency Dr R. Ekins - English Nature Mr D. Green - Directorate of Planning and Housing - Arun District Council (Observer) Mr Chris Harding of the Environment Agency was the Project Manager for the Group. Mr Malcolm Smith of Havant Borough Council was Chairman of the Steering Committee. The Plan was formulated by a project team led by HR Wallingford with support from Rendel Palmer & Tritton, the RACER Group of Portsmouth University, and Ecological Planning and Research Ltd. The Project Manager was Mr Tom Coates of HR Wallingford. Contributing authors included Mr Mark Lee (RPT), Mr Jerzy Motyka (HRW), Dr Kathryn Carpenter (HRW), Mr Andrew Bradbury (RPT) and Dr Malcolm Bray (RACER). The HR Wallingford job number was CGR 2024. Prepared by Approved by Date © HR Wallingford Umited 1997 E ut Solcot ShatliiK M iiufcinett Plan V o lu m e III Contents Page P refa ce.................................................................................................................................! ............................................. 1 C ontents.............................................................................................................................................................................. 3 G lo ssa ry.............................................................................................................................................................................. 4 1 Introduction ..........................................................................................i ..................................................7 1.1 Strategic background..........................................................................................................7 1.2 The SMP process.................................................................................................................7 1.3 The East Solent S M P ..........................................................................................................7 1.4 Report outline ..................................................................................................................... 8 2 Consultation ............................................................................................................................................ 12 2.1 Consultees .......................................................................................................................... 12 2.2 Consultation process .......................................................................................................12 3 Coastal p ro cesses................................................................................................................................... 15 3.1 Introduction.......................................................................................................................15 3.2 Geological evolu tion ........................................................................................................15 3.3 Historical evolu tion ..........................................................................................................17 3.4 Natural defences and saltmarsh ch an ges.....................................................................19 3.5 Tidal regim e....................................................................................................................... 25 3.6 Wave clim a te..................................................................................................................... 27 3.7 Sediment transport............................................................................................................28 3.8 Joint probability conditions and existing defence standards.................................. 28' 3.9 Future changes...................................................................................................................29 3.10 Existing monitoring programmes ................................................................................ 29 4 Existing shoreline management ....................................................................................................... 33 4.1 Introduction....................................................................................................................... 33 4.2 R ev iew ................................................................................................................................ 33 5 The natural environm ent..................................................................................................................... 37 5.1 Introduction....................................................................................................................... 37 5.2 Designated nature conservation areas ......................................................................... 37 5.3 Future designations ..........................................................................................................39 5.4 Responsibilities and restrictions due to conservation designations.......................39 5.5 Implications for shoreline management.......................................................................40 6 Land use and the human environm ent............................................................................................41 6.1 Land use and recreation...................................................................................................41 6.2 Landfill................................................................................................................................ 41 6.3 Nearshore activities..........................................................................................................41 6.4 Landscape conservation and historic s ite s .................................................................. 45 6.5 Implications for shoreline management.......................................................................48 6.6 Future trends ..................................................................................................................... 48 Tables Table 1 Consultees involvement in Stage 1 and summary of interests................................ 13 Table 2 Lithological descriptions of the East Solent solid and drift formations .............. 15 Table 3 Tide levels and predicted extreme water levels (m O D ).........................................25 Table 4 Extreme wave heights ...................................................................................................27 Table5 Worst case joint probability conditions......................................................................29 Table 6 Definition of site designations..................................................................................... 37 Table 7 Historic environment designations ............................................................................ 47 Table 8 A summary of relevant planning policies for the East Solent (see relevant local plans for details) ..................................................................................49 Table 9 Hampshire County Structural Plan (Review)