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Title: Thurne Broads model using 1993 data
Author: National Rivers Authority Anglian Region
Document Type: Monograph
The first detailed study of the Thume Broads was reported by Dr. R.A. Watson, in 1981. The objective of his study was mainly concerned with algal nutrients. The information he collected in terms of water quality and land drainage pump records is still a prime source of data. In order to better understand the water exchange and salinity mixing in the Thume Broads area, particularly at Hickling Broad and Horsey Mere the National Rivers Authority (NRA) in association with the Broads Authority and English Nature commissioned Binnie an Partners to develop a one dimensional hydrodynamic and salinity model of the Thume Broads system in January 1993. The hydrodynamic and salinity model was set-up on Mike 11 which is a well established river system model developed by Danish Hydraulic Institute. The model was run and calibrated using the 1976 data obtained by Watson. The predicted water levels agreed within 0.01 to 0.03 m with the observed levels. The salinity at Horsey Mere was reasonably well predicted. However the predicted salinity at Hickling Broad was lower than the observations. In order to improve the model performance, a revised model was developed in 1994, based on the existing model. The revised model was used to carry out additional sensitivity tests, re-examining the hydrology, evaporation and pump discharges. Taken together these changes were expected to reduce the freshwater flow and encourage salinity penetration. The results of the revised model were better, but were still considered unreliable for predicting salinity movement mainly because of uncertainties in the input data for 1976.
Publisher: National Rivers Authority
Publication Date: 1995
Publication Place: Peterborough
Subject Keywords: ModelsFlow rateData analysisWater levels
Geographic Keywords: The BroadsNorfolk
Extent: 13; + appendices
Total file downloads: 302

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