dc.identifier.uri |
http://dx.doi.org/10.15488/11908 |
|
dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/12003 |
|
dc.contributor.author |
Vu, Ngoc Quynh
|
eng |
dc.date.accessioned |
2022-03-28T13:44:30Z |
|
dc.date.available |
2022-03-28T13:44:30Z |
|
dc.date.issued |
2022 |
|
dc.identifier.citation |
Vu, Ngoc Quynh: A mixed-method approach for the investigation of riverine nitrate pollution at catchment scale. Hannover : Institut für Hydrologie und Wasserwirtschaft, 2022 (Mitteilungen des Instituts für Hydrologie und Wasserwirtschaft ; 112), vi, xiv, 127 S. |
eng |
dc.description.abstract |
It is important to have an insight into the fate of riverine nitrate at the catchment
level. The idea is to apply different methods for one same study site, in order to
overcome their limitations and take advantage of their strong points for the
research. An approach with necessary steps were proposed to be conducted: 1)
evaluation of the current nitrogen status in the water bodies; then 2)
identification of the major nitrogen input sources; and when possible 3)
development of a model which is able to simulate the nitrogen dynamics within
the river catchment.
A mixed-method approach, combining the experimental works (sampling
campaigns and labs), statistical analysis (multivariate tool PCA, dual stable
isotope tool), and modelling (isotope mixing model SIMMR, ecohydrological
model SWAT) was proven to be an effective approach to investigate the fate of
nitrogen, especially nitrate, at the river catchment level. In this dissertation, the
Fuhse River catchment was chosen as the study site for investigating the status
and dynamics of the riverine nitrate.
The results from hydrochemical statistical analyses showed that water of the
Fuhse River was an evolved type with mix abundances of ionic concentrations. It
was classified into the main hydrochemical group of Ca-Cl-SO4, which
represented that the water was influenced by anthropogenic activities. After
that, the dual isotope method and the mixing model SIMMR indicated the soil
nitrogen, manure and sewage as the predominant nitrate sources in this river
water, which might lead to the nitrate of the river exceeding the natural
threshold concentration. Finally, the incorporation of isotope results into SWAT
has improved the robustness and the creditability of model. The nitrate loads
were successfully simulated by the model. |
eng |
dc.language.iso |
eng |
eng |
dc.publisher |
Hannover : Institutionelles Repositorium der Leibniz Universität Hannover |
|
dc.relation.ispartofseries |
Mitteilungen des Instituts für Hydrologie und Wasserwirtschaft ; 112 |
|
dc.rights |
Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. |
eng |
dc.subject |
Nitrate |
eng |
dc.subject |
river water quality |
eng |
dc.subject |
hydrochemistry |
eng |
dc.subject |
stable isotopes |
eng |
dc.subject |
nutrient model |
eng |
dc.subject |
Nitrat |
ger |
dc.subject |
Flusswasserqualität |
ger |
dc.subject |
Hydrochemie |
ger |
dc.subject |
stabile Isotope |
ger |
dc.subject |
Nährstoffmodell |
ger |
dc.subject.ddc |
550 | Geowissenschaften
|
eng |
dc.title |
A mixed-method approach for the investigation of riverine nitrate pollution at catchment scale |
eng |
dc.type |
DoctoralThesis |
eng |
dc.type |
Text |
eng |
dcterms.extent |
vi, xiv, 127 S. |
|
dc.description.version |
publishedVersion |
eng |
tib.accessRights |
frei zug�nglich |
eng |