The purpose of this research is to investigate some of the factors controlling the rainfall-runoff relationship and consequently flood control in the Ardingly-Goldbridge basin, which is a subject that has given rise to considerable debate. Primarily the thesis is concerned with the study of rainfall and runoff with respect to various hydrometeorological and physical factors. Magnitude/frequency relationships of maximum daily rainfall and for rainfalls with durations of a to 72 hours are studied and the areal distribution of the maximum daily falls for numerous return periods are also investigated. The basis of this part of the study 'is an examination of extreme events using a Gumbel type of analysis. The seasonal distribution of these maximum falls was determined and shows a distinct pattern. Variations in the frequency per year of daily rainfalls over 25 mm. (daily rainburst) is investigated and the results showed that there was a quasi-regular fluctuation in the number of daily rainbursts over the period 1909- 1974. The magnitude/frequency relationship of annual maximum instantaneous discharge is studied and a brief assessment of the seasonal distribution of flood series shows that November was the most likely month for floods, especially those of greater magnitude. Annual maximum rainfall is compared with annual maximum flood and it was ascertained that there was no viable relationship between these two series. The relationship between rainfall and runoff, with regard to several hydrometeoro10gica1 factors, is investigated and an equation to predict the discharge peak determined. The prediction equation illustrates that the maximum peak discharge can be regarded as a function of rainfall intensity, rainfall duration, duration of rainfall up to time of concentration, and the previous discharge. Such analyses are considered vital as a basis for flood warning systems in the area.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:456494 |
| Date | January 1976 |
| Creators | Ghayoor, H. A. |
| Publisher | University of Sussex |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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