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Developing the Regression Equations to Determine the Bankfull Discharge from the Basin Characteristics

Chau Tran Kim, Toan Nguyen The, Duc Do Anh, Linh Nguyen Ha

Archives of Hydro-Engineering and Environmental Mechanics

2021

Vol. 68, nr 2

103--117

Bankfull discharge is an important criterion for flash flood warnings. In this study, the authors propose a new approach to determine the bankfull discharge for basins in Ha Giang province, Vietnam. The study combines the field survey to determine the bankfull discharge through the bankfull indicators and develop a multivariate regression equation between the bankfull discharge and the basin characteristics. The results of the study give a simple equation with 2 independent variables. They are the catchment area and the main river length. They show a strong relationship with the bankfull discharge with the R2 indexes in developing and validating process equal to 95.3% and 92.7%, respectively. With this approach, the workload is significantly reduced. However, the accuracy and flexibility of the total discharge calculation are enhanced. This will be the foundation to reduce uncertainty in flash flood warnings.

Bankfull discharge determination using the new Invertebrate Bankfull Assessment Method

Radecki-Pawlik A., Skalski T.

Journal of Water and Land Development

2008

no. 12

145-153

Along the paper the new method called Invertebrate Bankfull Assessment method (IBA method) of determination of bankfull discharge is presented. The investigation of bankfull discharge using IBA were performed within one Polish Carpathian stream in the mountain region: the Ochotnica Stream. As an index of bankfull the existence of certain species of invertebrates was used which are present and resistant to specific water discharge conditions. The borders within a cross section of the mountain stream with a gravel bed were defined where characteristic invertebrates are present which are recognized as bankfull borders. Finally three invertebrates benches (IB-ms) were recognized which are characterized by very specific invertebrate species. Bankfull discharge was calculated up to this IB-ms and corelated using Canonical Correspondence Analysis with other values of bankfull calculated for a cross section using different bankfull.

W pracy przedstawiono nową metodę wyznaczenia wartości przepływu brzegowego na wybranym odcinku rzeki górskiej. Metodę nazwano IBA od angielskiej nazwy: Invertebrate Bankfull Assesment Method. Metoda ta umożliwia określenie wartości przepływu brzegowego w zależności od tego, na jakiej wysokości brzegu potoku górskiego żyją zwierzęta makrobezkręgowe (tu zastosowane jako wskaźnikowe: biegaczowate), tolerujące lub nietolerujące zalew wodą. Badania metodycznie przeprowadzono w zlewni potoku Ochotnica w Gorcach - w Karpatach Polskich. W artykule wyznaczono trzy poziomy, na których żyją określone biegaczowate.