Current knowledge in tidal bores and their environmental, ecological and cultural impacts

Abstract

A tidal bore is a series of waves propagating upstream as the tidal flow turns to rising. It forms during the spring tide conditions when the tidal range exceeds 5-6 m and the flood tide is confined to a narrow funnelled estuary with low freshwater levels. A tidal bore is associated with a massive mixing of the estuarine waters that stirs the organic matter and creates some rich fishing grounds. Its occurrence is essential to many ecological processes and the survival of unique eco-systems. The tidal bore is also an integral part of the cultural heritage in many regions: the Qiantang River bore in China, the Severn River bore in UK, the Dordogne River in France. In this contribution, the environmental, ecological and cultural impacts of tidal bores are reviewed, explained and discussed.

Nutrient Condition of Kampar Big River Estuary: Distribution of N and P Concentrations Drifted by Tidal Bore ”Bono”

“…Kampar River conditions are unstable or frequently change according to the seasons and the wind direction. It causes a different volume of nutrient (N and P) that carried in by a tidal bore during high tide and low tide (Chanson, 2011).…”

“…Turbulence in the sediments causing more nutrient being transported and accumulated is highly depends on the undular bore activities (Chanson, 2011). It deposits nutrients in the upstream when energy transport of tidal bore becomes weaker (Chanson, 2004).…”

Remote Estimation of Total Suspended Solid (Tss) Transport Affected by Tidal Bore “Bono” of Kampar Big River Estuary Using Landsat 8 Oli Imagery

“…This condition also affects the water quality parameters inside the river as a tidal bore, activities directly affect the distribution of many chemical compounds and change the level of the standard quality of environment (Chanson, 2011). The water quality data were obtained by field measurement at the same time and the same point of TSS in situ (Table 5).…”

Tidal bore progressing on a small slope

“…Using the shallow-water equations, Barré de Saint-Venant [4] first predicted the theoretical development of a tidal bore. Other theoretical analysis and literature reviews comprise [5][6][7]. Although most studies considered horizontal channels, the bed of natural estuaries with tidal bore generally presents some slope.…”