scholarly journals Late summer glacial meltwater contributions to Bull Lake Creek stream flow and water quality, Wind River Range, Wyoming, USA

2019 ◽  
Vol 40 (5) ◽  
pp. 461-480 ◽  
Author(s):  
Jeffrey A. VanLooy ◽  
Gregory S. Vandeberg
Keyword(s):  
Water Quality ◽  
Stream Flow ◽  
Late Summer ◽  
Glacial Meltwater ◽  
Wind River Range

A study of water quality in an urban river and potential improvement using a prototype instream aerator

1989 ◽  
Vol 16 (3) ◽  
pp. 308-316 ◽  
Author(s):  
C. A. Town ◽  
D. S. Mavinic ◽  
B. Moore
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Data Base ◽  
Chlorophyll A ◽  
Late Summer ◽  
Urban River ◽  
Agricultural Activity ◽  
Fish Kills ◽  
Low Dissolved Oxygen ◽  
Oxygen Levels

Urban encroachment and intensive agricultural activity within the Serpentine–Nicomekl watershed (near Vancouver, B.C.) have caused a series of fish (salmon) kills on the Serpentine River since 1980. Low dissolved oxygen was responsible for these kills. This field project investigated some of the dynamic chemical and biological relationships within the river, as well as the use of an instream aerator as a temporary, in situ, water quality improvement measure. Weekly sampling for a 6-month period during the latter half of 1985 established a solid data base for deriving and interpreting meaningful interrelationships. A strong correlation between chlorophyll a and dissolved oxygen levels before the algae die-off supported the hypothesis that algae blooms dying in the fall could create a serious oxygen demand. Because of these environmental conditions, the river is unable to sustain healthy dissolved oxygen levels during this period. As such, a prototype, 460 m artificial aeration line was designed, installed, and monitored to evaluate its potential for alleviating low dissolved oxygen conditions and improving overall water quality during the critical fall period.The instream aerator ran continuously for over 2 months, starting in September 1985. Despite better-than-expected weather conditions (i.e., cool, wet weather) and relatively high dissolved oxygen levels during the fall of 1985, the data base appeared to support the use of this prototype aeration unit as a means of "upgrading" a stretch of an urban river subject to periodic, low dissolved oxygen levels. As a result, a 2-year follow-up study and river monitoring was initiated. In both 1986 and 1987, late summer and early fall river conditions resulted in the potential for serious salmon kills, due to higher-than-normal river temperatures and very low dissolved oxygen. In both instances, the instream aerator prevented such fish kills in a key stretch of the river. Expansion of the system to include other critical stretches of the Serpentine and other urban river systems, near Vancouver, is being considered. Key words: algae, aerator, chlorophyll a, eutrophic, fish kills, instream aeration, river improvement, urban river.

scholarly journals Applied AVSWAT 2000 for Assessment of Pollutant Load in Brantas River Basin, Indonesia

2011 ◽  
Vol 250-253 ◽  
pp. 3945-3948
Author(s):  
Mohammad Sholichin ◽  
Faridah Othman ◽  
S.M Shirazi ◽  
Shatirah Akib ◽  
Donny Harisuseno ◽  
...  
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Stream Flow ◽  
Goodness Of Fit ◽  
Assessment Tool ◽  
Organic N ◽  
Nutrient Load ◽  
Organic P ◽  
Dominant Type ◽  
Pollutant Load

This paper presented the results of assessment pollutant load such as nutrient and phosphorus on Brantas River basin Indonesia. A Soil and Water Assessment Tool (SWAT) was choose to applied in this study due to successful for simulate the effect land used management from large watershed in many countries. Stream flow and sediment yield were calibrated for the 1991-2003 period and validated for the 2004-2006 period. The resulting statistical goodness-of-fit was evaluated with the Nash-Sutcliffe coefficient NS = 0.38 and R2 of the one-to-one line for monthly stream flow was 0.725. Results showed that annual average nutrient loads such as organic N, organic P, nitrate, sediment P increased in trend from 1991 to 2006.Simulated results showed that average annual nutrient load was 60.88 kg N/ha/yr for organic N, 11.64 kg N/ha/yr for Nitrate, 0.08 kg P/ha/yr for organic P and 0.25 kg P/ha/yr for soluble P, respectively. The most dominant type of land use contributing to increased nutrient load in rivers was the rice field. The water quality of Brantas River did not meet class II in term of nutrient parameters based on local water quality standard.

Spatial and Temporal Changes in Habitat Conditions in the Na'aman Stream Ecosystem, Israel

1993 ◽  
Vol 27 (7-8) ◽  
pp. 387-395
Author(s):  
Jean-Jacques Jennings ◽  
Avital Gasith
Keyword(s):  
Water Quality ◽  
Species Diversity ◽  
A Priori ◽  
Hydrological Regime ◽  
Late Summer ◽  
Polluted Water ◽  
Habitat Conditions ◽  
Stream Ecosystem ◽  
Lowland Streams ◽  
Coastal Streams

Nahal Na'aman is a small, shallow coastal stream in northern Israel. A three year study was conducted to examine the effect of habitat conditions on the biological structure and function of the stream ecosystem. Here we describe temporal and spatial changes in the water regime and water quality as measures of the stream's habitat conditions. Habitat condition is strongly influenced by the hydrological regime and the water quality. In dry years the water level drops and the upper section of the stream may dry up completely. Inflow of polluted water from various sources increasingly reduces water quality downstream. In general, the Na'aman may be categorized as oligo- to mesohaline stream, highly enriched with organic matter and nutrients. Sporadic pollution events markedly affect the water quality resulting in hypertrophic conditions, particularly at times of low stream levels. Low water quality was detected also in association with the drying and refilling of the stream's sections in late summer and in fall, respectively, and following runoff in winter. The oligohaine nature of the stream a priori reduces species diversity relative to other freshwater, lowland streams/Based on water quality conditions, highest species diversity may be expected in the spring area and the upper section of the stream. However, habitat conditions in this section are most unstable due to changes of the hydrological regime. This, in turn, is expected to further reduce species richness and diversity. The extreme conditions are expected to determine the limit for the development of plant and animal life in the stream. This study illustrates the inherent problems of the coastal streams of Israel, namely, diminishing natural flow which is often replaced by discharge of effluent or sewage. Rehabilitation of the Na'aman and other coastal streams demands a radical solution for these problems.

Influence of the water quality on the occurrence of the Neotropical otter (Lontra longicaudis) (Olfers, 1818) in a human-altered river basin

2018 ◽  
Vol 69 (1) ◽  
pp. 122
Author(s):  
Lana Resende de Almeida ◽  
Maria João Ramos Pereira
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Stream Flow ◽  
Habitat Degradation ◽  
Distribution Range ◽  
Riverine Ecosystems ◽  
Non Invasive ◽  
Risk Monitoring ◽  
Influence Of Water ◽  
Lontra Longicaudis

The seeming tolerance of the Neotropical otter (Lontra longicaudis) to human-altered environments does not prevent it from being under threat in several areas across its distribution range. To improve our knowledge of the tolerance of the species to increasing levels of habitat degradation, and adding ecological information, we evaluated the influence of water quality, vegetation structure, seasonality and stream flow on the occurrence of L. longicaudis. We conducted monthly samplings of non-invasive biological material in 16 points across different classes of water quality in the Sinos River Basin in Rio Grande do Sul, Brazil, between January and August 2015. Water quality and stream flow positively influenced the occurrence of L. longicaudis; still, the species seems to reduce its occurrence only in waters of very low quality, showing tolerance to moderate levels of eutrophication. We conclude that the Neotropical otter is tolerant to human-altered environments, but beyond a certain threshold of water-quality degradation, otter persistence is at risk. Monitoring water quality is key for the preservation of riverine ecosystems, and measures to control water pollution and eutrophication are deemed necessary to guarantee the preservation of viable Neotropical otter populations across its distribution range.

The impact of bird populations on the microbiological quality of bathing waters

2005 ◽  
Vol 51 (3-4) ◽  
pp. 199-207 ◽  
Author(s):  
A. Wither ◽  
M. Rehfisch ◽  
G. Austin
Keyword(s):  
Water Quality ◽  
Microbiological Quality ◽  
Late Summer ◽  
Quality Data ◽  
Water Quality Data ◽  
North West ◽  
Bird Populations ◽  
Bathing Waters ◽  
The Impact

To ensure optimum quality at Bathing Waters, the control of diffuse sources of bacterial contamination is receiving increasing attention. As part of an initiative to improve the quality of the EU designated bathing waters on the Fylde Coast (North West England), a project was undertaken to quantify the faecal indicator load from birds and assess the significance on water quality. High bird counts are encountered on the Fylde Coast with gulls, feral pigeons and starlings being prominent. The piers at Blackpool make an attractive roost for starlings with numbers peaking at over 30,000 in late summer. Systematic recording of bird numbers and locations was undertaken during 2001/2. Estimates were also made of the daily faecal organism production by the different species. The spatial distribution of faecal organisms from the bird population was statistically linked to synoptic water quality data. This allowed estimates to be made of the contribution from birds to the faecal pollution load at the bathing waters. The work confirmed a statistically significant link between bird populations and water quality with a marked seasonal bias.

scholarly journals Use of Sentinel 2 – MSI for water quality monitoring at Alqueva reservoir, Portugal

2018 ◽  
Vol 380 ◽  
pp. 73-79 ◽  
Author(s):  
Miguel Potes ◽  
Gonçalo Rodrigues ◽  
Alexandra Marchã Penha ◽  
Maria Helena Novais ◽  
Maria João Costa ◽  
...  
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Chemical Properties ◽  
Late Summer ◽  
Water Quality Monitoring ◽  
Alqueva Reservoir ◽  
Total Capacity ◽  
Prediction Systems ◽  
Remote Sensing Techniques ◽  
Sentinel 2

Abstract. Alqueva reservoir located in southeast of Portugal has a surface area of 250 km2 and total capacity of 4150 hm3. Since 2006 the water quality of this reservoir is explored by the authors using remote sensing techniques. First using MERIS multi-spectral radiometer on-board of ENVISAT-1 and presently with MSI multi-spectral radiometer on-board SENTINEL-2. The existence of two satellites (A and B) equipped with MSI enable the area to be revisited, under the same viewing conditions, every 2–3 days. Since 2017 the multidisciplinary project ALOP (ALentejo Observation and Prediction systems) expands the team knowledge about the physical and bio-chemical properties of the reservoir. This project includes an integrated field campaign at different experimental sites in the reservoir and its shores, at least until September 2018. Previous algorithms developed by the team for MERIS are tested with the new MSI instrument for water turbidity, chlorophyll a concentration and density of cyanobacteria. Results from micro-algae bloom occurred in late summer/early autumn 2017 on the reservoir are presented, showing the capabilities of MSI sensor for detection and high resolution mapping over the reservoir. The results are compared with in situ sampling and laboratorial analysis of chlorophyll a associated with the bloom.

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