Experimental Study of a Right-Angled End Junction between a Pipe and an Open Channel

Nédélec, Yves; Gay, Bernard

doi:10.1061/(asce)0733-9429(2008)134:5(616)

Cited by 8 publications

(6 citation statements)

References 32 publications

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“…The downstream transfer is regulated by the ditch hydraulic behavior and thus depends on several characteristics, including the ditch shape and morphology, i.e., length, cross section, slope, bed, or sidewall roughness (Scholz and Trepel 2004), and upstream or downstream reach connections, such as confluence, piped sections, etc. (Nédélec and Gay 2008). Friction mechanisms that are induced by bed shape and roughness may significantly slow the water flow (Boutron et al 2011;Hösl et al 2012;Jarvela 2002;Kröger et al 2009;Wu et al 1999).…”

Section: Waterlogging Controlmentioning

confidence: 99%

Managing ditches for agroecological engineering of landscape. A review

Dollinger¹,

Dagès²,

Bailly

et al. 2015

Agron. Sustain. Dev.

114

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Agriculture must now feed the planet with the lowest environmental impact. Landscape management is a means to protect natural resources from the adverse impacts. In particular, the adequate management of ditches could improve crop quality. Here, we review ditch design and maintenance. We found the following major points: (1) ditch networks have been primarily designed for waterlogging control and erosion prevention. Nonetheless, when properly managed, farm ditches provide other important ecosystem services, namely groundwater recharge, flood attenuation, water purification, or biodiversity conservation. (2) All ditch ecosystem services depend on many geochemical, geophysical, and biological processes, whose occurrence and intensity vary largely with ditch characteristics. (3) The major ruling characteristics are vegetative cover; ditch morphology; slope orientation; reach connections such as piped sections and weirs, soil, sediment and litter properties, biota, and biofilms; and network topology. (4) Ditch maintenance is an efficient engineering tool to optimize ecosystem services because several ditch characteristics change widely with ditch maintenance. For instance, maintenance operations, dredging, chemical weeding, and burning improve waterlogging and soil erosion control, but they are negative for biodiversity conservation. Mowing has low adverse effects on biodiversity conservation and water purification when mowing is performed at an adequate season. The effects of burning have been poorly investigated.

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Section: Waterlogging Controlmentioning

confidence: 99%

Managing ditches for agroecological engineering of landscape. A review

Dollinger¹,

Dagès²,

Bailly

et al. 2015

Agron. Sustain. Dev.

114

View full text Add to dashboard Cite

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“…No strong rela onship could be established between the collector discharge limita on and the catchment hydrology, probably because pressuriza on aff ected only a small part of the drainage network. outlet in the arterial channel (Konyha et al, 1992;Nédélec and Gay, 2008). An analog behavior of this case has been described in the literature on controlled drainage and subirrigation drainage techniques (Skaggs, 1999;Wesström et al, 2004).…”

mentioning

confidence: 54%

“…The possible causes for pipe pressurization are numerous (Kohler et al, 2001; Nédélec and Gay, 2008). Some of them were investigated on the basis of available information on pipe design, visual observations, and experimental data.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, the base level of the outlet of network N2 into the arterial channel is located 5 cm above the bottom of the channel, so that this outlet can easily be submerged, even under low‐flow conditions. Alhough such a submersion may limit the discharge capacity of the whole network (Nédélec and Gay, 2008), the slope and length of collector C3 are considered significant enough to protect the upper parts of network N2 from tail‐water effects.…”

Section: Resultsmentioning

confidence: 99%

“…The drainage models assume free pressure conditions in the drain; however, water transfer in the buried pipe network can be constrained by pipe pressurization, which may significantly modify both drainage discharge and water table behavior. The pressurization may result from undersize pipes (e.g., Cavelaars et al, 1994; El‐Gammal et al, 1995) or from submersion of the outlet in the arterial channel (Konyha et al, 1992; Nédélec and Gay, 2008). An analog behavior of this case has been described in the literature on controlled drainage and subirrigation drainage techniques (Skaggs, 1999; Wesström et al, 2004).…”

mentioning

confidence: 99%

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Effect of Pipe Pressurization on the Discharge of a Tile Drainage System

Henine¹,

Nédélec²,

Augeard³

et al. 2010

Vadose Zone Journal

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Predicting the drainage impacts on downstream peak events is complex because it involves studying many physical processes at different interdependent scales: the individual field, the drainage network, and the catchment. This study focused on an experiment performed in a small subsurface‐drained catchment (130 ha), east of Paris, France. The main objective was to study the influence of the temporary pipe pressurization of the drainage network on the field drainage discharge during intense rainfall events. The flow rates at one buried pipe collector within the drainage network and at the catchment outlet were monitored concurrently with the pressure head in the pipe. Water levels were recorded in rows of piezometers aligned between drains connected to the studied collector so that water storage in the water table could be investigated during pipe pressurization. Two years of observations showed that when a pipe pressurization condition existed, the collector discharge was limited or reversed and the infiltrated water was temporarily stored within the field soil as the water table rose. Between the usual stages of normal subsurface drainage (peak flow and recession), two additional behaviors appeared to occur, similar to those resulting from implementing controlled drainage and subirrigation practices, and with noticeable consequences on the discharge hydrograph. No strong relationship could be established between the collector discharge limitation and the catchment hydrology, probably because pressurization affected only a small part of the drainage network.

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