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You searched for subject:(subsurface drainage systems). Showing records 1 – 2 of 2 total matches.

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Delft University of Technology

1. Van der Steen, A.J. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.

Degree: 2013, Delft University of Technology

Introduction Dutch municipalities have a legal duty in groundwater management. Adequate and effective management of horizontal subsurface drainage systems is important in fulfilling this duty. The service life time of these systems have to be optimized. Financial resources should be used efficiently. Only since a few years there is a proactive attitude towards management and maintenance of subsurface drainage systems. There is still little experience on how to manage and maintain urban subsurface drainage systems. Current knowledge on system behavior, failure mechanisms and effectiveness of maintenance is mainly based on research to field drainage in agricultural context. More fundamental knowledge on these topics is required in order to assess which maintenance and monitoring efforts are suitable for adequate system management. Approach My research focused on municipally managed, horizontal subsurface drainage systems (mainly installed in the sewer trench). System failure processes, possible locations of system failure, effectiveness of maintenance by jet-flushing and required monitoring and inspection efforts are studied. The knowledge is gained by execution of a detailed case study to two different system types located in the municipality of Utrecht. A predominantly submerged and a predominantly dry system. Past system state inspection and system behavior monitoring data are studied. Time series are analyzed with time series analyses tool Menyanthes. In the context of this research project, an extensive system behavior monitoring campaign is executed in the case systems. Furthermore, several inspection techniques including CCTV camera inspection are applied Results - Knowledge on failure mechanisms. The major failure mechanism observed in the case systems was the formation of ochre. Ochre contamination, a dynamic process, can lead to major problems with high groundwater tables. - Insight in location of failure. Results from this research show that besides problems in the drain-soil interface focused on in literature, internal network clogging can also be a major driver for system failure. - Insight in effectiveness of maintenance by jet-flushing. Jet-flushing appeared to be primary effective in removal of ochre blockages from the internal drain cross-sections. Time-scale of re-clogging is however short. Within several months, the effect can be negated. - A possible approach in system investigation and assessment. Based on the obtained experience in inspecting and monitoring the case systems, an approach in system investigation and assessment is developed. The approach is presented in a decision tree-like scheme. The scheme can be used for the development of a management and maintenance plan for a particular system. Recommendation for future research This research can be considered as initiating research. New questions arose during the research. Permanently submerged (modern) subsurface drainage systems are not yet studied in detail. Some processes are not fully understood yet. Further research is therefore… Advisors/Committee Members: Van de Giesen, N.C., Van de Ven, F.H.M., Langeveld, J., Kruithof, A..

Subjects/Keywords: subsurface drainage systems; horizontal subsurface drainage; groundwater management

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Van der Steen, A. J. (2013). Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f

Chicago Manual of Style (16th Edition):

Van der Steen, A J. “Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.” 2013. Masters Thesis, Delft University of Technology. Accessed April 07, 2020. http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f.

MLA Handbook (7th Edition):

Van der Steen, A J. “Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.” 2013. Web. 07 Apr 2020.

Vancouver:

Van der Steen AJ. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. [Internet] [Masters thesis]. Delft University of Technology; 2013. [cited 2020 Apr 07]. Available from: http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f.

Council of Science Editors:

Van der Steen AJ. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. [Masters Thesis]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f

2. Keïta, A. Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso.

Degree: 2015, CRC Press/Balkema

<p style="margin-left: 20.85pt;">SUMMARY <p style="margin-left: 20.85pt;">The contrasted global population growth with the multiplication of the constraints to developing new irrigation systems puts a special challenge upon human crop production systems that needs to be taken up. The populations in many countries in Asia, Middle East and Africa are expected to double in the coming 50 years. The experience of the green revolution in Asia – during which 70% of food production increase was provided by irrigated agriculture – shows that there is not only a need to strive to increase such crop production systems, but also to improve the production efficiency of existing ones. In fact, as a much worrying case, rice production in valley bottom irrigated lands of African Tropical Savannah is far to yield the expected amount of cereals. One of the major constraints to this production is iron toxicity subsequent to poor drainage conditions. According to Africa Rice, at least 60% of the Tropical Savannah swampy valley bottoms are affected by different degree of iron toxicity. The yield in many areas drops to zero, leaving behind millions of disappointed and impoverished farmers. Therefore, it is not surprising that there is strong research dynamic – ranging from agronomy to microbiology – that strives to propose alleviating solutions to rice iron toxicity. Because prevalent anoxic conditions in the soil combined with iron reducing bacteria development were found a basic contributing factor to iron toxicity,  this research has chosen to investigate subsurface drainage potential contributions to solving this issue. <p style="margin-left: 20.85pt;">Two complementary series of operations – designed within two project- components and focused on five basic questions closely related to the contributing factors to iron toxicity development – were performed. In fact, the research project was implemented in two major components: field surveys and designed experiments. The field surveys investigated iron toxicity triggering or aggravating factors such as clay proportions, ferrous ion Fe2+ concentration, dissolved oxygen, soil acidity or water management. Drawing profit from the knowledge gained in survey research and literature review, two parallel experiments were designed using concrete microplots on one hand and buckets on the other hand, to statistically ascertain the impact of subsurface on soil acidity and ferrous iron concentration changes. All the operations performed within the two components of this research project endeavoured to answer the following five research questions:   <ol> how is ferrous iron formed and distributed in soils invaded by iron toxicity? how is clay spread within the valley? how is soil permeability affected by clay distribution in the valley? how can water management help improve soil conditions? what is the impact of subsurface drainage on iron toxicity? </ol>   <p style="margin-left:… Advisors/Committee Members: Wageningen University, E. Schultz, H. Yacouba.

Subjects/Keywords: oryza; ondergrondse drainage; drainage; irrigatie; rijst; savannen; irrigatiesystemen; waterbeheer; burkina faso; oryza; subsurface drainage; drainage; irrigation; rice; savannas; irrigation systems; water management; burkina faso

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Keïta, A. (2015). Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso. (Doctoral Dissertation). CRC Press/Balkema. Retrieved from http://library.wur.nl/WebQuery/wurpubs/486083 ; urn:nbn:nl:ui:32-486083 ; urn:nbn:nl:ui:32-486083 ; http://library.wur.nl/WebQuery/wurpubs/486083

Chicago Manual of Style (16th Edition):

Keïta, A. “Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso.” 2015. Doctoral Dissertation, CRC Press/Balkema. Accessed April 07, 2020. http://library.wur.nl/WebQuery/wurpubs/486083 ; urn:nbn:nl:ui:32-486083 ; urn:nbn:nl:ui:32-486083 ; http://library.wur.nl/WebQuery/wurpubs/486083.

MLA Handbook (7th Edition):

Keïta, A. “Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso.” 2015. Web. 07 Apr 2020.

Vancouver:

Keïta A. Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso. [Internet] [Doctoral dissertation]. CRC Press/Balkema; 2015. [cited 2020 Apr 07]. Available from: http://library.wur.nl/WebQuery/wurpubs/486083 ; urn:nbn:nl:ui:32-486083 ; urn:nbn:nl:ui:32-486083 ; http://library.wur.nl/WebQuery/wurpubs/486083.

Council of Science Editors:

Keïta A. Subsurface drainage of valley bottom irrigated rice schemes in tropical savannah : case studies of Tiefora and Moussodougou in Burkina Faso. [Doctoral Dissertation]. CRC Press/Balkema; 2015. Available from: http://library.wur.nl/WebQuery/wurpubs/486083 ; urn:nbn:nl:ui:32-486083 ; urn:nbn:nl:ui:32-486083 ; http://library.wur.nl/WebQuery/wurpubs/486083

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