Flow resistance and hydraulic capacity of water courses with aquatic weed growth. Part 2

• Published in: Irrigation and drainage systems 1997-05, Vol.11 (2), p.171-184
• Main Author: Querner, E P
• Format: Article
• Language: English
• Subjects: afvoer; Agrohydrologie; Agrohydrology; analogen; analogues; Aquatic plants; Aquatic weeds; canals; channels; Computational methods; Cross-sections; discharge; ditches; Drainage; flow; Flow of water; Flow resistance; fluids; Growing season; Hydraulics; hydrodynamica; hydrodynamics; hydrologie; hydrology; kanalen; kanalen, klein; liquids; Marine biology; Mathematical models; modellen; onkruidbestrijding; rivers; rivieren; schadelijke waterplanten; sloten; streams; stroming; vloeistoffen (fluids); vloeistoffen (liquids); water; Watercourses; waterlopen; waterways; waterwegen; weed control; Weeds
• ISSN: 1573-0654; 0168-6291; 0168-6291; 1573-0654
• DOI: 10.1023/A:1005751704089

The flow resistance is generally derived from fieldmeasurements, using the total wetted area of the cross-section.Less attention has been paid to the aquatic weed growth stageand often different resistance have been derived. In this paperthe flow resistance required in the Manning formula wascalculated from laboratory experiments and field data. A goodsolution appeared to be using the unobstructed part of the cross-section only and excluding the part covered by weeds. Apractical solution was found using the relative weed obstructionin the water courses to represent the weed growth. Weedobstruction was measured throughout the growing season. Thedata were obtained from water courses without any weedcontrol and also in sections where weeds were cleared twiceduring the growing season.[PUBLICATION ABSTRACT]