An integrated and physically based nitrogen cycle catchment model

2009 ◽  
Vol 40 (4) ◽  
pp. 347-363 ◽  
Author(s):  
J. R. Hansen ◽  
J. C. Refsgaard ◽  
V. Ernstsen ◽  
S. Hansen ◽  
M. Styczen ◽  
...  
Keyword(s):  
Land Use ◽  
Nitrogen Cycle ◽  
Root Zone ◽  
River System ◽  
Zone Model ◽  
Physically Based ◽  
Daily Discharge ◽  
Land Use And Management ◽  
Catchment Model ◽  
Modelling Approach

This paper presents a modelling approach where the entire land-based hydrological and nitrogen cycle from field to river outlet was included. This approach is based on a combination of a physically based root zone model (DAISY) and a physically based distributed catchment model (MIKE SHE/MIKE11). Large amounts of data available from statistical databases and surface maps were used for determination of land use and management practises to predict leaching within the catchment. The modelling approach included a description of nitrate transformations in the root zone, denitrification in the saturated zone, wetland areas and the river system within the catchment. The modelling approach was applied for the Odense Fjord catchment which constitutes one of the pilot river basins for implementation of the European Water Framework Directive. The model simulated overall nitrogen fluxes in the river system consistent with the observed values but showed some discrepancies between simulated and observed daily discharge values The results showed significant differences of denitrification capacities between larger areas such as sub-catchments. This approach has great potential for optimal planning of the establishment of wetlands and further land use legislation with respect to high denitrification rates.

scholarly journals Cost-effective water quality improvement in linked terrestrial and marine ecosystems: a spatial environmental - economic modelling approach

2009 ◽  
Vol 60 (11) ◽  
pp. 1150 ◽  
Author(s):  
P. C. Roebeling ◽  
M. E. van Grieken ◽  
A. J. Webster ◽  
J. Biggs ◽  
P. Thorburn
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Land Use ◽  
Environmental Economic ◽  
Management Practice ◽  
Economic Modelling ◽  
Agricultural Industry ◽  
Water Quality Improvement ◽  
Land Use And Management ◽  
Modelling Approach

Worldwide, coastal and marine ecosystems are affected by water pollution originating from coastal river catchments, even though ecosystems such as the Great Barrier Reef are vital from an environmental as well as an economic perspective. Improved management of coastal catchment resources is needed to remediate this serious and growing problem through, e.g. agricultural land use and management practice change. This may, however, be very costly and, consequently, there is a need to explore how water quality improvement can be achieved at least cost. In the present paper, we develop an environmental–economic modelling approach that integrates an agricultural production system simulation model and a catchment water quality model into a spatial environmental–economic land-use model to explore patterns of land use and management practice that most cost-effectively achieve specified water quality targets and, in turn, estimate corresponding water pollution abatement cost functions. In a case study of sediment and nutrient water pollution by the sugarcane and grazing industries in the Tully–Murray catchment (Queensland, Australia), it is shown that considerable improvements in water quality can be obtained at no additional cost, or even benefit, to the agricultural industry, whereas larger water quality improvements come at a significant cost to the agricultural industry.

A Distributed Groundwater/Surface Water Model for the Suså-Catchment

1982 ◽  
Vol 13 (5) ◽  
pp. 299-310 ◽  
Author(s):  
Jens Chr Refsgaard ◽  
Eggert Hansen
Keyword(s):  
Hydrological Cycle ◽  
Root Zone ◽  
Water Model ◽  
Model Description ◽  
Zone Model ◽  
Distributed Hydrological Model ◽  
Groundwater Abstraction ◽  
Moisture Deficit ◽  
Physically Based ◽  
Phreatic Aquifers

A distributed hydrological model has been developed for the Suså catchment, covering about 1,000 km2 of Zealand, Denmark. Being a physically based description of the entire land phase of the hydrological cycle, the model is the result of an integration of an integrated finite difference groundwater model, an aquitard model, a model for unconfined phreatic aquifers and a root zone model. The main objective of the model has been to make possible predictions of the hydrological consequences of groundwater abstraction on the river discharges and on the hydraulic heads of the aquifers. Therefore special attention is given to the interaction between the streams and the aquifers. The model was tested against field data of streamflow, actual evapotranspiration, soil moisture deficit, drain water discharges and hydraulic heads of the confined aquifer. A model description and some results from the calibration and tests are given.

Detection of nitrogen cycle genes in soils for measuring the effects of changes in land use and management

2008 ◽  
Vol 40 (7) ◽  
pp. 1637-1645 ◽  
Author(s):  
M.J. Colloff ◽  
S.A. Wakelin ◽  
D. Gomez ◽  
S.L. Rogers
Keyword(s):  
Land Use ◽  
Nitrogen Cycle ◽  
Land Use And Management

Simulating heavy rainfall events for parameterizing a first application of the physically based soil erosion model EROSION3D in South Africa

2020 ◽  
Author(s):  
Andreas Kaiser ◽  
Michael Geißler ◽  
Jay Le Roux ◽  
Marike Stander ◽  
George van Zijl ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
South African ◽  
Land Degradation ◽  
Field Work ◽  
Organic Carbon Content ◽  
Runoff Simulation ◽  
Erosion Model ◽  
Physically Based ◽  
Land Use And Management

<p>Soil erosion is a frequently tackled field of research and plays a major role in land degradation. Representing a discontinuous process soil loss is strongly determined by single events, which leads to high demands on modelling approaches.</p><p>Here we present a first application of the physically-based soil erosion model EROSION3D in a South African setting within the framework of the project SALDi (South African Land Degradation Monitor). Parameterization of the model requires intensive field work in accordance to land use and management patterns, soil types and topography. The experimental determination of physical and hydrological processes for selected sites allows for an improvement of the modelling results. Thus, rainfall and runoff simulation campaigns were carried out on various sites with a 3 x 1 m² mobile rainfall simulator. Additionally, UAV and TLS surveying, soil sampling, laboratory analysis and digital soil mapping complemented the approach. The created datasets are firstly handled in EROSION2D to calibrate soil erosivity and hydraulic conductivity and then introduced to EROSION3D for including land use, precipitation, elevation, multi-layered soil properties, organic carbon content and additional model input parameters.</p><p>The modelling procedure was applied within the boundaries of a research catchment close to Ladybrand in the Free State for first test runs. Furthermore, the same approach showed distinct differences on a conventionally tilled field vs. a conservational approach. An upscaling to larger catchments will then be carried out in basins with protected soils within Kruger National Park to directly compare them to results from intensively cultivated agricultural sites adjacent to the park boundaries.</p>

scholarly journals Food security among dryland pastoralists and agropastoralists: The climate, land-use change, and population dynamics nexus

2021 ◽  
pp. 205301962110075
Author(s):  
Ilan Stavi ◽  
Joana Roque de Pinho ◽  
Anastasia K Paschalidou ◽  
Susana B Adamo ◽  
Kathleen Galvin ◽  
...  
Keyword(s):  
Land Use ◽  
Food Security ◽  
Management Practices ◽  
Relevant Literature ◽  
Global Changes ◽  
Food Utilization ◽  
Special Importance ◽  
Food Security Status ◽  
Global Action ◽  
Land Use And Management

During the last decades, pastoralist, and agropastoralist populations of the world’s drylands have become exceedingly vulnerable to regional and global changes. Specifically, exacerbated stressors imposed on these populations have adversely affected their food security status, causing humanitarian emergencies and catastrophes. Of these stressors, climate variability and change, land-use and management practices, and dynamics of human demography are of a special importance. These factors affect all four pillars of food security, namely, food availability, access to food, food utilization, and food stability. The objective of this study was to critically review relevant literature to assess the complex web of interrelations and feedbacks that affect these factors. The increasing pressures on the world’s drylands necessitate a comprehensive analysis to advise policy makers regarding the complexity and linkages among factors, and to improve global action. The acquired insights may be the basis for alleviating food insecurity of vulnerable dryland populations.

scholarly journals Exploring the variability of soil nutrient outflows as influenced by land use and management practices in contrasting agro-ecological environments

2021 ◽  
pp. 147450
Author(s):  
Temesgen Mulualem ◽  
Enyew Adgo ◽  
Derege Tsegaye Meshesha ◽  
Atsushi Tsunekawa ◽  
Nigussie Haregeweyn ◽  
...  
Keyword(s):  
Land Use ◽  
Management Practices ◽  
Soil Nutrient ◽  
Land Use And Management

scholarly journals Land-use and agriculture in Denmark around year 1900 and the quest for EU Water Framework Directive reference conditions in coastal waters

AMBIO ◽  
2021 ◽  
Author(s):  
Bent T. Christensen ◽  
Birger F. Pedersen ◽  
Jørgen E. Olesen ◽  
Jørgen Eriksen
Keyword(s):  
Land Use ◽  
Water Framework Directive ◽  
Coastal Waters ◽  
Root Zone ◽  
Reference Conditions ◽  
Ecological Status ◽  
Agricultural Activity ◽  
Eu Water Framework Directive ◽  
Alternative Approach ◽  
The Eu

AbstractThe EU Water Framework Directive (WFD) aims to protect the ecological status of coastal waters. To establish acceptable boundaries between good and moderate ecological status, the WFD calls for reference conditions practically undisturbed by human impact. For Denmark, the nitrogen (N) concentrations present around year 1900 have been suggested to represent reference conditions. As the N load of coastal waters relates closely to runoff from land, any reduction in load links to agricultural activity. We challenge the current use of historical N balances to establish WFD reference conditions and initiate an alternative approach based on parish-level land-use statistics collected 1896/1900 and N concentrations in root zone percolates from experiments with year 1900-relevant management. This approach may be more widely applicable for landscapes with detailed historic information on agricultural activity. Using this approach, we find an average N concentration in root zone percolates that is close to that of current agriculture. Thus, considering Danish coastal waters to be practically unaffected by human activity around year 1900 remains futile as 75% of the land area was subject to agricultural activity with a substantial potential for N loss to the environment. It appears unlikely that the ecological state of coastal waters around year 1900 may serve as WFD reference condition.

Sign in / Sign up

Export Citation Format

Share Document