Acknowledgements
Mawddach-Wnion catchment location map
Publications related to the project

1. Introduction

1.1 Objectives of the study

Flooding in the Mawddach and Wnion catchments
Hypotheses
Synopsis of chapters
References


1.2 The Study Area

Geology
Geomorphology
Soils
Vegetation
Industrial development
Summary
References

2. Meteorology

2.1 Meteorological Principles

Theories of midlatitude cyclone structure
Orographic effects on rainfall
Convective storms
Summary
References


2.2 Rainfall in the Mawddach catchment

Rainfall monitoring
Classification of rainfall patterns
The extended rainfall period of February 2004
July 2001 exceptional rainfall event
Summary
References


2.3 Meteorological modelling

Using atmospheric soundings
Summary
References


2.4 The MM5 modelling system

Configuring and running the MM5 model
Frontal rainfall events
Statistical analysis
Rainfall radar
Optimisation of MM5 models using a neural network
Structure of frontal events
Squall line convection
Summary
References

3. Catchment Hydrology

3.1 Hydrological modelling systems

Summary
References


3.2 Hillslope hydrology

Subcatchments and river reaches
River channel surveying
Hydrograph recording
Soil shallow stormflow
Watershed Modelling System
Results of model runs
Summary
References


3.3 Sediment movement

Sediment accumulation around Dolgellau
Approaches to sediment modelling
GSTARS sediment models for the Mawddach catchment
Summary
References


3.4 River and floodplain processes

Dolgellau flood modelling
Effects of floodplain forestry on water flow
Calibration of floodplain forestry models
Simulation of floodplain forestry schemes for the Wnion valley
River-groundwater interactions
Afon Wen groundwater model
Summary
References


3.5 Peat blanket bogs

Hydrology of blanket bogs
Blanket peat in the Mawddach catchment
Waen y Griafolen case study
Waen y Griafolen groundwater model
Summary
References


3.6 The Mawddach estuary

Tidal flows in the estuary
Estuary hydrological modelling
Upper basin model
Sediment modelling
Summary
References

4. Integrated catchment modelling

4.1 Integrated meteorological-hydrological models

Requirements for a Mawddach integrated model
Mathematical basis for the hillslope model
Summary
References


4.2 Developing the Mawddach hillslope model

Creating an initialisation file
Running the hillslope program
Summary
References


4.3 Validation of the hillslope model

Validation for runoff monitoring sites
Channel routing
Waen y Griafolen blanket bog model
Summary
References


4.4 Results of runs of the integrated model

Configuration for distributed processing
Frontal storms of February 2004
Convective storm of July 2001
Summary
References

5. Discussion

5.1 Meteorology

Rainfall forecasting
Meteorological modelling
Future developments in meteorological modelling
References


5.2 Hydrology

Hillslope runoff
River flows
Groundwater effects
Peat blanket bogs
Floodplain overbank discharge
River sediment
Tidal estuary


5.3 Catchment modelling

6. Conclusions and Recommendations

Appendices

A: User guide for the Hillslope Model

B: Subcatchment descriptions

C: Hydrograph site calibration

Full list of references