scholarly journals A River Temperature Model to Assist Managers in Identifying Thermal Pollution Causes and Solutions

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1060 ◽  
Author(s):  
Reza Abdi ◽  
Theodore Endreny
Keyword(s):  
Urban Areas ◽  
Riparian Vegetation ◽  
Thermal Loading ◽  
Riparian Forest ◽  
Thermal Pollution ◽  
Hyporheic Exchange ◽  
Exchange Flow ◽  
Storm Events ◽  
River Temperature ◽  
Riparian Shading

Thermal pollution of rivers degrades water quality and ecosystem health, and cities can protect rivers by decreasing warmer impervious surface stormwater inflows and increasing cooler subsurface inflows and shading from riparian vegetation. This study develops the mechanistic i-Tree Cool River Model and tests if it can be used to identify likely causes and mitigation of thermal pollution. The model represents the impacts of external loads including solar radiation in the absence of riparian shade, multiple lateral storm sewer inflows, tributaries draining reservoirs, groundwater flow, and hyporheic exchange flow in dry weather steady flows and wet weather unsteady flows. The i-Tree Cool River Model estimates the shading effects of the riparian vegetation and other features as a function of heights and distances as well as solar geometry. The model was tested along 1500 m of a New York mountain river with a riparian forest and urban areas during 30 h with two summer storm events in 2007. The simulations were sensitive to the inflows of storm sewers, subsurface inflows, as well as riparian shading, and upstream boundary temperature inflows for steady and unsteady conditions. The model simulated hourly river temperature with an R2 of 0.98; when shading was removed from the simulation the R2 decreased 0.88, indicating the importance of riparian shading in river thermal modeling. When stormwater inflows were removed from the simulation, the R2 decreased from 0.98 to 0.92, and when subsurface inflows were removed, the R2 decreased to 0.94. The simulation of thermal loading is important to manage against pollution of rivers.

Effects of riffle–step restoration on hyporheic zone chemistry in N-rich lowland streams

2006 ◽  
Vol 63 (1) ◽  
pp. 120-133 ◽  
Author(s):  
Tamao Kasahara ◽  
Alan R Hill
Keyword(s):  
Urban Areas ◽  
Hyporheic Zone ◽  
Stream Water ◽  
Ion Concentration ◽  
Hyporheic Exchange ◽  
Ecosystem Functions ◽  
Exchange Flow ◽  
Nutrient Inputs ◽  
Lowland Streams ◽  
Hyporheic Zones

Stream restoration projects that aim to rehabilitate ecosystem health have not considered surface–subsurface linkages, although stream water and groundwater interaction has an important role in sustaining stream ecosystem functions. The present study examined the effect of constructed riffles and a step on hyporheic exchange flow and chemistry in restored reaches of several N-rich agricultural and urban streams in southern Ontario. Hydrometric data collected from a network of piezometers and conservative tracer releases indicated that the constructed riffles and steps were effective in inducing hyporheic exchange. However, despite the use of cobbles and boulders in the riffle construction, high stream dissolved oxygen (DO) concentrations were depleted rapidly with depth into the hyporheic zones. Differences between observed and predicted nitrate concentrations based on conservative ion concentration patterns indicated that these hyporheic zones were also nitrate sinks. Zones of low hydraulic conductivity and the occurrence of interstitial fines in the restored cobble-boulder layers suggest that siltation and clogging of the streambed may reduce the downwelling of oxygen- and nitrate-rich stream water. Increases in streambed DO levels and enhancement of habitat for hyporheic fauna that result from riffle–step construction projects may only be temporary in streams that receive increased sediment and nutrient inputs from urban areas and croplands.

scholarly journals Determinants of bird assemblage composition in riparian vegetation on sugarcane farms in the Queensland Wet Tropics

2015 ◽  
Vol 21 (1) ◽  
pp. 60 ◽  
Author(s):  
Anita F. Keir ◽  
Richard G. Pearson ◽  
Robert A. Congdon
Keyword(s):  
Riparian Vegetation ◽  
Wildlife Conservation ◽  
Agricultural Landscape ◽  
Riparian Zone ◽  
Riparian Forest ◽  
Agricultural Landscapes ◽  
Generalist Species ◽  
Assemblage Composition ◽  
Bird Assemblages ◽  
Wet Tropics

Remnant habitat patches in agricultural landscapes can contribute substantially to wildlife conservation. Understanding the main habitat variables that influence wildlife is important if these remnants are to be appropriately managed. We investigated relationships between the bird assemblages and characteristics of remnant riparian forest at 27 sites among sugarcane fields in the Queensland Wet Tropics bioregion. Sites within the remnant riparian zone had distinctly different bird assemblages from those of the forest, but provided habitat for many forest and generalist species. Width of the riparian vegetation and distance from source forest were the most important factors in explaining the bird assemblages in these remnant ribbons of vegetation. Gradual changes in assemblage composition occurred with increasing distance from source forest, with species of rainforest and dense vegetation being replaced by species of more open habitats, although increasing distance was confounded by decreasing riparian width. Species richness increased with width of the riparian zone, with high richness at the wide sites due to a mixture of open-habitat species typical of narrower sites and rainforest species typical of sites within intact forest, as a result of the greater similarity in vegetation characteristics between wide sites and the forest proper. The results demonstrate the habitat value for birds of remnant riparian vegetation in an agricultural landscape, supporting edge and open vegetation species with even narrow widths, but requiring substantial width (>90 m) to support specialists of the closed forest, the dominant original vegetation of the area.

scholarly journals A Cumulative Rainfall Function for Subhourly Design Storm in Mediterranean Urban Areas

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Marco Carbone ◽  
Michele Turco ◽  
Giuseppe Brunetti ◽  
Patrizia Piro
Keyword(s):  
Urban Areas ◽  
Goodness Of Fit ◽  
Nonlinear Least Squares ◽  
Least Square ◽  
Rainfall Time Series ◽  
Storm Events ◽  
Design Storm ◽  
Double Exponential ◽  
Two Parameters ◽  
Precipitation Records

Design storms are very useful in many hydrological and hydraulic practices and are obtained from statistical analysis of precipitation records. However considering design storms, which are often quite unlike the natural rainstorms, may result in designing oversized or undersized drainage facilities. For these reasons, in this study, a two-parameter double exponential function is proposed to parameterize historical storm events. The proposed function has been assessed against the storms selected from 5-year rainfall time series with a 1-minute resolution, measured by three meteorological stations located in Calabria, Italy. In particular, a nonlinear least square optimization has been used to identify parameters. In previous studies, several evaluation methods to measure the goodness of fit have been used with excellent performances. One parameter is related to the centroid of the rain distribution; the second one is related to high values of the standard deviation of the kurtosis for the selected events. Finally, considering the similarity between the proposed function and the Gumbel function, the two parameters have been computed with the method of moments; in this case, the correlation values were lower than those computed with nonlinear least squares optimization but sufficiently accurate for designing purposes.

scholarly journals Soil loss risk and habitat quality in streams of a meso-scale river basin

2007 ◽  
Vol 64 (4) ◽  
pp. 336-343 ◽  
Author(s):  
Alexandre Marco da Silva ◽  
Lilian Casatti ◽  
Clayton Alcarde Alvares ◽  
Aline Maria Leite ◽  
Luiz Antonio Martinelli ◽  
...  
Keyword(s):  
River Basin ◽  
Habitat Quality ◽  
Urban Areas ◽  
Riparian Vegetation ◽  
Soil Loss ◽  
Buffer Strips ◽  
Physical Damage ◽  
High Chemical ◽  
Sediment Delivery ◽  
Chemical Purity

Soil loss expectation and possible relationships among soil erosion, riparian vegetation and water quality were studied in the São José dos Dourados River basin, State of São Paulo, Brazil. Through Geographic Information System (GIS) resources and technology, Soil Loss Expectation (SLE) data obtained using the Universal Soil Loss Equation (USLE) model were analyzed. For the whole catchment area and for the 30 m buffer strips of the streams of 22 randomly selected catchments, the predominant land use and habitat quality were studied. Owing mainly to the high soil erodibility, the river basin is highly susceptible to erosive processes. Habitat quality analyses revealed that the superficial water from the catchments is not chemically impacted but suffers physical damage. A high chemical purity is observed since there are no urban areas along the catchments. The water is physically poor because of high rates of sediment delivery and the almost nonexistence of riparian vegetation.

scholarly journals Associations between fish assemblage and riparian vegetation in the Corumbataí River Basin (SP)

2007 ◽  
Vol 67 (2) ◽  
pp. 191-195 ◽  
Author(s):  
M. Cetra ◽  
M. Petrere JR.
Keyword(s):  
Species Richness ◽  
River Basin ◽  
Fish Species ◽  
Sugar Cane ◽  
Fish Assemblage ◽  
Vegetation Cover ◽  
Riparian Vegetation ◽  
Riparian Forest ◽  
The State ◽  
Multivariate Techniques

This work intends to examine if there are associations between fish species and the state of conservation of the riparian forest in the Corumbataí River Basin. Four main rivers were chosen for this study with three sites on each. Collections were carried out from March to June and from September to December 2001. Multivariate techniques were applied to determine the correlation between species richness and the order of the rivers, preservation level of the riparian forest, shade level, presence or absence of Eucalyptus, sugar cane and pastures, and surrounding declivity stability of the sites. Species richness was highest at locations with greater vegetation cover and preserved riparian forest.

scholarly journals Longitudinal dimensions of land-use impacts in riverine ecosystems

2019 ◽  
Vol 31 ◽  
Author(s):  
Rafael Feijó-Lima ◽  
Eugenia Zandonà ◽  
Bruna Suelen da Silva ◽  
Flavia Tromboni ◽  
Timothy Peter Moulton ◽  
...  
Keyword(s):  
Riparian Vegetation ◽  
Riparian Forest ◽  
Atlantic Rainforest ◽  
Fragmented Landscape ◽  
Macroinvertebrate Communities ◽  
Buffer Strips ◽  
Land Use Impacts ◽  
Stream Flows ◽  
Riverine Ecosystems ◽  
Forest Remnants

Abstract: Aim Rivers are linked longitudinally via the flow of water and the spatial dimensions of the changes in local riparian vegetation are still poorly understood. Recent modifications to the Native Vegetation Protection Law allow reduction of lateral buffer strips and amnesty for riparian vegetation removal, which might increase the fragmentation of native riparian vegetation, especially for Atlantic Rainforest streams. Methods We present two case studies conducted in a stream draining a fragmented landscape in the Atlantic Rainforest. The stream flows through two abrupt transitions (forest-pasture-forest) and we investigated how far the upstream effects of a given riparian condition could be detected in the downstream reach for a suite of variables. Results We show that the effects of land cover propagate downstream for both algal and macroinvertebrate communities. For some variables of interest, these effects might extend up to a km downstream from the transition. Conclusions There is a need to understand how the distribution of riparian forest remnants contribute to maintaining watershed-scale resilience to impacts.

Study of diffuse source pollution management for land use and drainage system planning

2001 ◽  
Vol 44 (7) ◽  
pp. 203-208 ◽  
Author(s):  
K. Yamada ◽  
T. Funaki ◽  
S. Honda ◽  
M. Sugihara
Keyword(s):  
Land Use ◽  
Urban Area ◽  
Land Use Planning ◽  
Urban Areas ◽  
Drainage System ◽  
Pollutant Removal ◽  
Storm Events ◽  
Road Surfaces ◽  
Using Data

This study aims to clarify the mass balance of pollutants during both dry periods and storm events and to discuss the effects of some strategies such as pollutant removal, land use planning and new drainage systems by simulation. Three subjects are discussed in this paper. First, the amount of pollutants entering Lake Biwa from an urban area have been roughly estimated by using data collected by the local government. Second, many additional samples were collected from road surfaces, house roofs and parking lots to consider the role of land use in pollutant runoff. Third, some ongoing BMP projects in an urban area are introduced. As a result, some ideas on how to solve the problem of diffuse pollution in urban areas have been obtained.

scholarly journals Effects of proximity to urban areas on a riparian bird community in remnant Atlantic Forest in southeastern Brazil

2019 ◽  
Vol 14 (7) ◽  
pp. 1
Author(s):  
Ana Cecília de Paula Lourenço ◽  
Maria Cecília Barbosa de Toledo
Keyword(s):  
Urban Areas ◽  
Riparian Forest ◽  
Bird Species ◽  
Bird Community ◽  
Habitat Characteristics ◽  
Southeastern Brazil ◽  
Average Height ◽  
Trophic Groups ◽  
Generalist Species ◽  
Canopy Opening

   The goal of this study was to evaluate the effect of urban activities on the structure and composition of a bird community in riparian forests in the state of São Paulo, Brazil. The study was carried out in seven areas of remnant riparian forest where fixed points have been established to sample bird species. Richness, diversity, abundance, frequency and trophic groups were used as metrics of the bird community. At each point measurements were taken for: (1) habitat characteristics: average height of trees, number of trees above 2m, number of shrubs <2m and the percentage of canopy opening; (2) neighborhood characteristics: closest distance from open areas, highways, urban areas, river and floodplain to the point of observation. The observations resulted in 88 species of birds belonging to 34 families. The most representative families were Tyrannidae, Thraupidae and Picidae. The most predominant trophic groups were insectivorous (54%), omnivorous (11.5%) and frugivorous (10.3%). The results obtained showed that the number of trees explained the variation in abundance, while the mean height of the trees explained variations in richness and frequency. Overall, the bird community was negatively affected by proximity of urban areas and highways. In conclusion, the community of birds in the riparian forest may be affected by the loss of trees above 2m and by urbanization, leading mainly to the replacement of species belonging to specialist trophic groups by generalist species and those more adjusted to human presence.

scholarly journals Fruit-feeding butterflies (Lepidoptera: Nymphalidae) of the Área de Proteção Especial Manancial Mutuca, Nova Lima and Species list for the Region of Belo Horizonte, Minas Gerais, Brazil

2015 ◽  
Vol 15 (3) ◽  
Author(s):  
André Roberto Melo Silva ◽  
Douglas Vitor Pontes ◽  
Marco Paulo Guimarães ◽  
Marina Vicente de Oliveira ◽  
Lucas Tito Faria de Assis ◽  
...  
Keyword(s):  
Riparian Vegetation ◽  
Riparian Forest ◽  
Minas Gerais ◽  
Field Sampling ◽  
Species Occurrence ◽  
Species List ◽  
Clear Trend ◽  
Belo Horizonte ◽  
One Year ◽  
Rich Fauna

A study of the assembly of fruit-feeding butterflies in the Área de Proteção Especial Manancial Mutuca, Nova Lima, MG was conducted with the goal of inventorying the species of the site. Forty-two traps were used to attract fruit-feeding butterflies, divided between Cerrado (rupestrian field) and riparian vegetation, monthly over one year. 2245 butterflies, which belonged to 63 species, were recorded. Of this total, fourty-eight species were collected in the Cerrado, twenty-one exclusively in this environment, forty-two in riparian forest, fifteen being exclusive to this environment, and twenty-seven species were sampled in both environments. From the total of sampled species, thirty-five were considered rare, eight accessory species, and twenty constant species. Prepona deiphile deiphile (Charaxine) is classified as vulnerable on the Minas Gerais’ list and on the national list of threatened species. The collector curve showed no clear trend to stabilization, suggesting that there are species still not sampled in the study area. Adding the data from field sampling to the information on species occurrence in the literature and in entomological collections, the current number of frugivorous butterflies species for the region of Belo Horizonte is 104. This result foregrounds the importance of APE Mutuca for maintaning a rich fauna of frugivorous butterflies to the area.

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