EFFECTS OF RIVER TRAINING STRUCTURES ON THE SEDIMENT BALANCE OF A SAND - BEARING RIVER

1. INTROOrCTIOXThe upper Tisza in Hungary is a sand bed alluvial river. presenting several river training problems. In order to solve these problems first the laws of free river--bed evolution must be clarified thenthe effects of existing river training s…

EFFECTS OF RIVER TRAINING STRUCTURES ON THE SEDIMENT BALANCE OF A SAND - BEARING RIVER

Based on our previous research results the regulation of a Tisza river reach was worked out. After the construction of the training structures the theory was proved. and the river "accepted" the regulation and contributed to the formation of the desired alignment of the course. The former regulation of the Tisza river in Hungary has significantly influenced the channel regime and sediment conditions as well. Recently on certain stretches of the river bed and bank erosion, flow disturbancies and consequent damages of the training structures have been observed. To prepare the engineering project envisaged, detailed field measurements have been performed. including characteristic channel cross-section survey. velocity profiles taken. suspended sediment and bed-load (bottom material) sampling etc. Using the results and date of the measurements. hydraulic model experiments with mobile bed and erodible banks have been performed in the laboratory. Interconnections between the pattern of transverse training structures and the sediment/channel balance have been investigated. Proposals have been made to assist engineering measures conform to the properties of the river - reach in question.