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https://www.readbyqxmd.com/read/28919651/land-use-change-impacts-on-floods-at-the-catchment-scale-challenges-and-opportunities-for-future-research
#1
M Rogger, M Agnoletti, A Alaoui, J C Bathurst, G Bodner, M Borga, V Chaplot, F Gallart, G Glatzel, J Hall, J Holden, L Holko, R Horn, A Kiss, S Kohnová, G Leitinger, B Lennartz, J Parajka, R Perdigão, S Peth, L Plavcová, J N Quinton, M Robinson, J L Salinas, A Santoro, J Szolgay, S Tron, J J H van den Akker, A Viglione, G Blöschl
Research gaps in understanding flood changes at the catchment scale caused by changes in forest management, agricultural practices, artificial drainage, and terracing are identified. Potential strategies in addressing these gaps are proposed, such as complex systems approaches to link processes across time scales, long-term experiments on physical-chemical-biological process interactions, and a focus on connectivity and patterns across spatial scales. It is suggested that these strategies will stimulate new research that coherently addresses the issues across hydrology, soil and agricultural sciences, forest engineering, forest ecology, and geomorphology...
July 2017: Water Resources Research
https://www.readbyqxmd.com/read/28918983/distribution-of-organic-contamination-of-sediments-from-ichkeul-lake-and-bizerte-lagoon-tunisia
#2
Fida Ben Salem, Olfa Ben Said, Ezzeddine Mahmoudi, Robert Duran, Mathilde Monperrus
Analyses of organochlorine pesticides (OCPs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and butyl tins (BuSn) were conducted on sediments from Ichkeul Lake-Bizerte Lagoon watershed (Tunisia). A total of 59 compounds (16 PAHs, 12 PCBs, 22 OCPs and 9 BuSn) were measured in 40 surface sediment samples collected during two campaigns. High concentrations of total PAHs were identified in the lagoon ranging from 122 to 19600ng·g(-1). Several OCPs, including endrin, dieldrin, and lindane (Hexachlorocyclohexane or HCH or BHC) were found in high concentrations in Ichkeul Lake, ranging from 28 to 2012ngg(-1)...
September 14, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28918079/clogging-of-an-alpine-streambed-by-silt-sized-particles-insights-from-laboratory-and-field-experiments
#3
Jasmin Fetzer, Markus Holzner, Michael Plötze, Gerhard Furrer
Clogging of streambeds by suspended particles (SP) can cause environmental problems, as it can negatively influence, e.g., habitats for macrozoobenthos, fish reproduction and groundwater recharge. This especially applies in the case of silt-sized SP. Until now, most research has dealt with coarse SP and was carried out in laboratory systems. The aims of this study are to examine (1) whether physical clogging by silt-sized SP exhibits the same dynamics and patterns as by sand-sized SP, and (2) the comparability of results between laboratory and field experiments...
September 7, 2017: Water Research
https://www.readbyqxmd.com/read/28917180/learning-from-the-operation-pathology-and-maintenance-of-a-bioretention-system-to-optimize-urban-drainage-practices
#4
Marina Batalini de Macedo, Altair Rosa, César Ambrogi Ferreira do Lago, Eduardo Mario Mendiondo, Vladimir Caramori Borges de Souza
LID practices for runoff control are increasingly being used as an integrated solution in urban drainage, helping to achieve hydrological balance close to the pre-urbanized period and decrease the diffuse pollution transported to urban rivers. Regarding bioretention, there is already broad knowledge about the detention of peak flows and their treatment capacity for many pollutants. However, there are still few field studies in microdrainage scale, which analyze the actual operation of these devices and raise common problems found, especially in subtropical climate...
September 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28915463/freshwater-vulnerability-under-high-end-climate-change-a-pan-european-assessment
#5
A G Koutroulis, L V Papadimitriou, M G Grillakis, I K Tsanis, K Wyser, R A Betts
As freshwater availability is crucial for securing a sustainable, lower‑carbon future, there is a critical connection between water management and climate policies. Under a rapidly changing climate, it is more important than ever to estimate the degree of future water security. This is a challenging task as it depends on many different variables: the degree of warming and its consequent effects on hydrological resources, the water demand by different sectors, and the possible ameliorations or deteriorations of the effects due to climate change adaptation and mitigation strategies...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28914971/extending-data-worth-analyses-to-select-multiple-observations-targeting-multiple-forecasts
#6
Troels N Vilhelmsen, Ty P A Ferré
Hydrological models are often set up to provide specific forecasts of interest. Owing to the inherent uncertainty in data used to derive model structure and used to constrain parameter variations, the model forecasts will be uncertain. Additional data collection is often performed to minimize this forecast uncertainty. Given our common financial restrictions, it is critical that we identify data with maximal information content with respect to forecast of interest. In practice, this often devolves to qualitative decisions based on expert opinion...
September 15, 2017: Ground Water
https://www.readbyqxmd.com/read/28903173/climatic-and-watershed-controls-of-dissolved-organic-matter-variation-in-streams-across-a-gradient-of-agricultural-land-use
#7
Peng Shang, YueHan Lu, YingXun Du, Rudolf Jaffé, Robert H Findlay, Anne Wynn
Human land use has led to significant changes in the character of dissolved organic matter (DOM) in lotic ecosystems. These changes are expected to have important environmental and ecological consequences. However, high spatiotemporal variability has been reported in previous studies, and the underlying mechanisms remain inadequately understood. This study assessed variation in the properties of stream water DOM within watersheds across a gradient of agricultural land use with grazing pasture lands as the dominant agricultural type in the southeastern United States...
September 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28900807/ecotoxicological-impact-assessment-of-the-brine-discharges-from-a-desalination-plant-in-the-marine-waters-of-the-algerian-west-coast-using-a-multibiomarker-approach-in-a-limpet-patella-rustica
#8
Meriem Benaissa, Omar Rouane-Hacene, Zitouni Boutiba, Marielle E Guibbolini-Sabatier, Christine Risso-De Faverney
The aim of our study is to evaluate the impact of Bousfer desalination plant brine discharges on the Algerian west coast, on a natural population of the marine gastropod mollusc Patella rustica. The effects of a chronic exposure to such discharges are complex to understand due to the combined effects of environmental physico-chemical parameters (e.g., high salinity) and different pollutants that can modulate the physiological responses of this species to stress. In this context, we assessed the biological effects in a marine species P...
September 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28898775/the-effect-of-anthropogenic-impoundment-on-dissolved-organic-matter-characteristics-and-copper-binding-affinity-insights-from-fluorescence-spectroscopy
#9
Bin Hu, Peifang Wang, Chao Wang, Jin Qian, Jun Hou, Xiaoai Cui, Nannan Zhang
Excitation-emission matrix fluorescence spectroscopy combined with parallel factor analysis (EEM-PARAFAC) and two-dimensional correlation spectroscopy (2D-COS) were applied to evaluate the effects of anthropogenic impoundment on the characteristics of dissolved organic matter (DOM) and its heavy metal binding affinity. Three field-sampling cruises conducted in Hongze Lake from 2015 to 2016 were classified as early impoundment and late impoundment cruises according to the hydrological conditions. Five fluorescence components were derived from EEM-PARAFAC, including three humic-like components (C1C3) and two protein-like components (C4 and C5)...
September 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28894294/synchronous-precipitation-reduction-in-the-american-tropics-associated-with-heinrich-2
#10
Martín Medina-Elizalde, Stephen J Burns, Josué Polanco-Martinez, Fernanda Lases-Hernández, Raymond Bradley, Hao-Cheng Wang, Chuan-Chou Shen
During the last ice age temperature in the North Atlantic oscillated in cycles known as Dansgaard-Oeschger (D-O) events. The magnitude of Caribbean hydroclimate change associated with D-O variability and particularly with stadial intervals, remains poorly constrained by paleoclimate records. We present a 3.3 thousand-year long stalagmite δ(18)O record from the Yucatan Peninsula (YP) that spans the interval between 26.5 and 23.2 thousand years before present. We estimate quantitative precipitation variability and the high resolution and dating accuracy of this record allow us to investigate how rainfall in the region responds to D-O events...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28888206/riverine-discharges-to-chesapeake-bay-analysis-of-long-term-1927-2014-records-and-implications-for-future-flows-in-the-chesapeake-bay-basin
#11
Karen C Rice, Douglas L Moyer, Aaron L Mills
The Chesapeake Bay (CB) basin is under a total maximum daily load (TMDL) mandate to reduce nitrogen, phosphorus, and sediment loads to the bay. Identifying shifts in the hydro-climatic regime may help explain observed trends in water quality. To identify potential shifts, hydrologic data (1927-2014) for 27 watersheds in the CB basin were analyzed to determine the relationships among long-term precipitation and stream discharge trends. The amount, frequency, and intensity of precipitation increased from 1910 to 1996 in the eastern U...
September 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28883636/precipitation-in-a-warming-world-assessing-projected-hydro-climate-changes-in-california-and-other-mediterranean-climate-regions
#12
Suraj D Polade, Alexander Gershunov, Daniel R Cayan, Michael D Dettinger, David W Pierce
In most Mediterranean climate (MedClim) regions around the world, global climate models (GCMs) consistently project drier futures. In California, however, projections of changes in annual precipitation are inconsistent. Analysis of daily precipitation in 30 GCMs reveals patterns in projected hydrometeorology over each of the five MedClm regions globally and helps disentangle their causes. MedClim regions, except California, are expected to dry via decreased frequency of winter precipitation. Frequencies of extreme precipitation, however, are projected to increase over the two MedClim regions of the Northern Hemisphere where projected warming is strongest...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28881307/using-spatial-stream-network-models-and-long-term-data-to-understand-and-predict-dynamics-of-faecal-contamination-in-a-mixed-land-use-catchment
#13
Aaron James Neill, Doerthe Tetzlaff, Norval James Colin Strachan, Rupert Lloyd Hough, Lisa Marie Avery, Helen Watson, Chris Soulsby
An 11year dataset of concentrations of E. coli at 10 spatially-distributed sites in a mixed land-use catchment in NE Scotland (52km(2)) revealed that concentrations were not clearly associated with flow or season. The lack of a clear flow-concentration relationship may have been due to greater water fluxes from less-contaminated headwaters during high flows diluting downstream concentrations, the importance of persistent point sources of E. coli both anthropogenic and agricultural, and possibly the temporal resolution of the dataset...
September 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28881213/trends-in-riverine-element-fluxes-a-chronicle-of-regional-socio-economic-changes
#14
Jiří Kopáček, Josef Hejzlar, Petr Porcal, Maximilian Posch
We show how concentrations of water solutes in the Vltava River (Czech Republic) and their riverine outputs from the catchment were modified by socio-economic changes, land use, and hydrology between 1960 and 2015. In the early 1960s, HCO3 and Ca were the dominant ions. During 1960-1989 (a period of planned economy with an over-use of synthetic fertilizers, excessive draining of agricultural land and little environmental protection), the riverine concentrations of strong acid anions (SAAs: SO4, NO3, and Cl) increased 2-4-fold and their leaching was accompanied for by a 1...
August 30, 2017: Water Research
https://www.readbyqxmd.com/read/28881211/the-in-situ-bacterial-production-of-fluorescent-organic-matter-an-investigation-at-a-species-level
#15
B G Fox, R M S Thorn, A M Anesio, D M Reynolds
Aquatic dissolved organic matter (DOM) plays an essential role in biogeochemical cycling and transport of organic matter throughout the hydrological continuum. To characterise microbially-derived organic matter (OM) from common environmental microorganisms (Escherichia coli, Bacillus subtilis and Pseudomonas aeruginosa), excitation-emission matrix (EEM) fluorescence spectroscopy was employed. This work shows that bacterial organisms can produce fluorescent organic matter (FOM) in situ and, furthermore, that the production of FOM differs at a bacterial species level...
August 18, 2017: Water Research
https://www.readbyqxmd.com/read/28875164/increasing-drought-in-jordan-climate-change-and-cascading-syrian-land-use-impacts-on-reducing-transboundary-flow
#16
Deepthi Rajsekhar, Steven M Gorelick
In countries where severe drought is an anticipated effect of climate change and in those that heavily depend on upstream nations for fresh water, the effect of drier conditions and consequent changes in the transboundary streamflow regime induced by anthropogenic interventions and disasters leads to uncertainty in regional water security. As a case in point, we analyze Jordan's surface water resources and agricultural water demand through 2100, considering the combined impacts of climate change and land-use change driven by the Syrian conflict...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28874558/glacier-shrinkage-driving-global-changes-in-downstream-systems
#17
Alexander M Milner, Kieran Khamis, Tom J Battin, John E Brittain, Nicholas E Barrand, Leopold Füreder, Sophie Cauvy-Fraunié, Gísli Már Gíslason, Dean Jacobsen, David M Hannah, Andrew J Hodson, Eran Hood, Valeria Lencioni, Jón S Ólafsson, Christopher T Robinson, Martyn Tranter, Lee E Brown
Glaciers cover ∼10% of the Earth's land surface, but they are shrinking rapidly across most parts of the world, leading to cascading impacts on downstream systems. Glaciers impart unique footprints on river flow at times when other water sources are low. Changes in river hydrology and morphology caused by climate-induced glacier loss are projected to be the greatest of any hydrological system, with major implications for riverine and near-shore marine environments. Here, we synthesize current evidence of how glacier shrinkage will alter hydrological regimes, sediment transport, and biogeochemical and contaminant fluxes from rivers to oceans...
September 5, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28873497/calculating-groundwater-response-times-for-flow-in-heterogeneous-porous-media
#18
Matthew J Simpson
Predicting the amount of time required for a transient groundwater response to take place is a practical question that is of interest in many situations. This time scale is often called the response time. In the groundwater hydrology literature, there are two main methods used to calculate the response time: (1) both the transient and steady-state groundwater flow equations are solved, and the response time is taken to be amount of time required for the transient solution to approach the steady solution within some tolerance; and (2) simple scaling arguments are adopted...
September 5, 2017: Ground Water
https://www.readbyqxmd.com/read/28865268/effects-of-resource-availability-and-hydrological-regime-on-autochthonous-and-allochthonous-carbon-in-the-food-web-of-a-large-cross-border-river-china
#19
Yuanyuan Zheng, Jiangong Niu, Qiong Zhou, Congxin Xie, Zhixin Ke, Dapeng Li, Yongwen Gao
Resource availability and flooding disturbance restrict the amount of energy available to the upper trophic level consumers and thus determine the trophic structure and energy mobilization in river food webs. In this study, we evaluated the availability of primary and secondary food resources, food web structure (determined by δ(13)C and δ(15)N) and relative contributions of autochthonous and allochthonous particulate carbon to aquatic consumers in the Irtysh River, which spans from northwest China to Kazakhstan and suffers from a long frozen period...
August 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28864689/stepped-wedge-cluster-randomised-controlled-trial-to-assess-the-cardiovascular-health-effects-of-a-managed-aquifer-recharge-initiative-to-reduce-drinking-water-salinity-in-southwest-coastal-bangladesh-study-design-and-rationale
#20
Abu Mohd Naser, Leanne Unicomb, Solaiman Doza, Kazi Matin Ahmed, Mahbubur Rahman, Mohammad Nasir Uddin, Shamshad B Quraishi, Shahjada Selim, Mohammad Shamsudduha, William Burgess, Howard H Chang, Matthew O Gribble, Thomas F Clasen, Stephen P Luby
INTRODUCTION: Saltwater intrusion and salinisation have contributed to drinking water scarcity in many coastal regions globally, leading to dependence on alternative sources for water supply. In southwest coastal Bangladesh, communities have few options but to drink brackish groundwater which has been associated with high blood pressure among the adult population, and pre-eclampsia and gestational hypertension among pregnant women. Managed aquifer recharge (MAR), the purposeful recharge of surface water or rainwater to aquifers to bring hydrological equilibrium, is a potential solution for salinity problem in southwest coastal Bangladesh by creating a freshwater lens within the brackish aquifer...
September 1, 2017: BMJ Open
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