Lake Project Research Articles

Effectiveness of diluting Moses Lake, Washington, with low phosphorus Columbia River water

Welch, EB and Brattebo SK. 2024. Effectiveness of diluting Moses Lake, Washington, with low phosphorus Columbia River water. Lake Reserv. Manage. 40:xxxx-xxxx. Moses Lake has been rehabilitated by dilution with low total phosphorus (TP) inflow to improve lake quality in 46 of the past 47 years. Inflows of low TP (7 µg/L) Columbia River water (CRW), which enters during April–September, have ranged from around 75 to over 400 × 106 m3 (mcm), representing 0.5–2.5 total lake volumes annually. The CRW inflows substantially lowered the May–September average lower lake TP from 152 µg/L during 1969–1970 before dilution to 25 µg/L during the past 24 years when CRW input averaged 250 mcm. Total P decreased to an average of 65 µg/L during 11 of the first 12 years following the start of large CRW inputs with the Clean Lakes Project in 1977. Increased CRW inflow since 2000 reduced TP to less than 30 µg/L and has greatly improved lake quality and lowered the cyanobacteria fraction of phytoplankton biomass. Cyanobacteria were minimal at 5–22% of phytoplankton biomass in 2 years (2001, 2021) with 284 mcm of CRW inflow and average TPs of 19 and 20 µg/L. Average TP was 20 and 25 µg/L and cyanobacteria were 12 and 22% in 2022 and 2023 with less CRW (235 and 197 mcm). Even in the more enriched upper lake, TP in 2021–2023 averaged about half that of the previous 4 years (39 vs. 73 µg/L) and cyanobacteria averaged 33% of phytoplankton biomass. Unless the internal TP load is reduced substantially, CRW input should be at least 250 mcm to dilute external and internal loading and to hold TP below 30 µg/L and minimize cyanobacteria, as occurred in 2021–2023.

The Sacred Lake Project: preliminary findings from the Lusatian site of Papowo Biskupie, Poland

AbstractIn 2023, prospection of a dried-out lake near Papowo Biskupie in north-central Poland identified substantial deposits of bronze artefacts. Excavation revealed further deposits and dozens of human skeletons that date from 1000–400 BC, suggesting that the site held particular significance as a place for sacrificial offerings in the Lusatian culture.

Characteristics of Hydrogen and Oxygen Isotope Composition in Precipitation, Rivers, and Lakes in Wuhan and the Ecological Environmental Effects of Lakes

Wuhan has a dense network of rivers and lakes. Due to the city’s development, the water system has been fragmented, the degradation of lakes is becoming increasingly severe, and the eco-environment has been significantly damaged. By collecting samples of the central surface water bodies in Wuhan, including Yangtze River water, Han River water, lake water, and precipitation, and by utilizing hydrogen and oxygen isotopes and multivariate statistical methods, the hydraulic connectivity and ecological environmental effects between the Yangtze River, the Han River, and the lakes were revealed. The results indicated the following: (1) The local meteoric water Line (LMWL) in the Wuhan area was δD = 7.47δ18O + 1.77. The river water line equation was approximately parallel to the atmospheric precipitation line in the Wuhan area. The intercept and slope of the lake waterline equation were significantly smaller. The enrichment degree of δ18O and δD was Yangtze River < Hanjiang River < lake water. (2) The cluster analysis showed that the lakes could be divided into two types, i.e., inner-flow degraded (IFD) lakes and outer-flow ecological (OFE) lakes. Urban expansion has resulted in fragmentation of the IFD lakes, changing the connectivity between rivers and lakes and weakening the exchange of water bodies between the Yangtze River and lakes. Simultaneously, evaporation has caused hydrogen and oxygen isotope fractionation, resulting in the relative enrichment of isotopes. The IFD lakes included the Taizi Lake, Yehu Lake, and the Shenshan Lake. The OFE lakes and the Yangtze River were active, evaporation was weak, and the hydrogen and oxygen isotopes were relatively depleted, mainly including the Huangjia Lake, the East Lake, the Tangxun Lake, etc. (3) The excessive deuterium (d-excess) parameter values in the Yangtze River and the Han River water were positive. In contrast, the d values in the lakes were mainly negative. In the case of a weakened water cycle, the effect of evaporation enrichment on lake water δ18O and δD had a significant impact. It is suggested that the water system connection project of “North Taizi Lake-South Taizi Lake-Yangtze River” and the small lakes connecting to large lakes project of “Wild Lake-Shenshan Lake-Tangxun Lake” should be implemented in time to restore the water eco-environment.

Razvitie glavnoj rechnoj sistemy Kitaya v transgranichnyh bassejnah s tochki zreniya konceptual'noj istorii

The implementation of the river chief system (RCS) in China is a key move to solve its complex water problems and sustain healthy rivers and lakes. The article considers the Weishan Lake project as an innovative way to develop RCS in transboundary basins: it draws on the underlying international practice experience in transboundary river/lake water environment governance.

P081And then what happened? Assessing contraceptive use outcomes over three years among participants in the her salt lake contraceptive initiative

<h3>Objectives</h3> The purpose of this study was to assess contraceptive outcomes over time among a population of people who had initially received no-cost contraception through a county-wide contraceptive access program. <h3>Methods</h3> We included all participants who had enrolled in the HER Salt Lake project's longitudinal study. Participants reported contraceptive outcomes in surveys at nine time points over three years. We conducted multinomial logistic regression analyses assessing predictors of each outcome (continuation, switching, discontinuation) over the study period. We also assessed patterns of discontinuation and subsequent method uptake among participants. <h3>Results</h3> At the 36-month follow-up, among 4,289 participants included in the sample, 48.5% continued their baseline method, 23.2% reported at least one period of discontinuation, and 28.2% reported switching methods at least once. Factors associated with contraceptive switching included younger age, selecting a short-acting method, clinic where the method was received and time since baseline. People planning a pregnancy within five years were less likely to discontinue than those who never wanted a pregnancy, those who were uncertain, or those who wanted pregnancy in 5–10 years. Short-acting method selection, clinic where method was received, and time since baseline also increased the likelihood of discontinuation. Among those who discontinued, 21% subsequently returned to their previous method, 28% eventually reported new method uptake, and 51% did not report a new method after discontinuing. People who discontinued injectables, pills, or vaginal rings were more likely than others to report returning to their previous method. <h3>Conclusions</h3> Change in contraceptive use is common over time, even among those who receive no-cost access.

Regional geology and tectonic framework of the Southern Indian domain, Trans-Hudson orogen, Manitoba

The collaborative federal–provincial Southern Indian Lake project in north-central Manitoba covered an area of more than 3500 km2 of the Trans-Hudson orogen. Regional-scale geological mapping, sampling, and lithogeochemical, isotopic, and geochronological studies resulted in the identification of distinct assemblages of supracrustal rocks and varied episodes of plutonism. A granodiorite gneiss dated at ca. 2520 Ma is interpreted to represent the basement of the Southern Indian domain and is considered a separate crustal domain, named the Partridge Breast block. The Churchill River assemblage is composed of juvenile pillow basalt with intervening clastic sedimentary rocks, possibly a reflection of plume magmatism related to initial rifting of the Hearne craton margin. The Pukatawakan Bay assemblage consists mainly of massive to pillowed, juvenile metabasaltic rocks and associated basinal metasedimentary rocks. The Partridge Breast Lake assemblage is dominated by continental-arc volcanic and volcaniclastic rocks associated with basinal metasedimentary rocks. The Strawberry Island assemblage, consisting of arenite and polymictic conglomerate, is interpreted to have been deposited in a foreland-basin basin or intra-orogen pull-apart basin environment. The Whyme Bay assemblage is characterized by fluvial-alluvial orogenic sediments and is temporally linked to the Sickle Group rocks in the Lynn Lake greenstone belt. Granitoid rocks, dominantly monzogranite and granodiorite, range in age from ca. 1890 to 1830 Ma and occur throughout the Southern Indian domain, and intermediate and mafic intrusions of similar ages are also present. In this paper, we integrate these new data into a tectonic framework for the Southern Indian domain of the Trans-Hudson orogen in Manitoba.

Paragenesis of gold mineralization at the Kiyuk Lake Project, Kivalliq Region, Nunavut, Canada

ABSTRACT Exploration for gold in Nunavut has been primarily focused on Archean greenstone belts in the north and coastal regions of the territory, resulting in large areas of underexplored terrain in the south. The Kiyuk Lake property is located in the underexplored southwest corner of the Kivalliq Region of Nunavut within the Hearne domain of the ∼1.9 Ga western Churchill Province. The property is hosted by Proterozoic calc-silicate and clastic sedimentary units of the Hurwitz Group (&amp;lt;2.4–1.9 Ga) and the unconformably overlying Kiyuk Group (1.9–1.83 Ga). Gold mineralization in Proterozoic sedimentary rocks is rare in the Canadian Shield, so the Rusty Zone at Kiyuk Lake presents a unique opportunity to study the enigmatic gold mineralization hosted in such sedimentary rocks. Mineralization at the Rusty Zone is hosted by an immature lithic wacke cut by thin intermediate dikes that are associated with hydrothermal breccias composed of Fe-carbonate, calcite, calcic-amphibole, Fe-sulfide, Fe-oxide minerals, and gold. Textural and timing relationships suggest that the gold mineralization is post-sedimentary and syn- to post-intrusion of intermediate dikes. Stable isotope thermometry suggests that mineralization took place between 450 and 600 °C, and geochronological studies indicate that the intrusion and mineralization occurred before or about 1.83 Ga. Using basement breaching thrusts faults as conduits to the surface, over-pressurization along a later normal fault is thought to be the primary cause for the localized breccia pipe that controls gold mineralization. The hydrothermal fluids are postulated to be volatile-rich aqueous solutions exsolved from a source of cooling magmas at depth. Although sub-economic at present, the occurrence of high-grade gold in a Paleoproterozoic basin such as Kiyuk Lake could signal a new opportunity for exploration for gold in the Canadian Shield.

Reactivation mechanisms and related-porosity enhancement of shear zones in the context of basement-hosted uranium mineralization: case of the Spitfire discovery in the Patterson Lake corridor, Canada

Uranium mineralization in the Patterson Lake corridor (southwestern Churchill province, Canada) is hosted in the metamorphosed Paleoproterozoic basement covered to the north by the flat-lying sandstone formations of the Athabasca Basin. The mineralization is exclusively contained within inherited ductile structures that were reactivated under a brittle regime. Petrographic and micro-structural studies of drill core samples from the Spitfire discovery (Hook Lake project) reveal the linkages between structural evolution of the basement, alteration and mineralization. During basement exhumation, localization of non-coaxial deformation led to the formation of a large anastomosing shear zone system made of mylonitic rocks. Strain localization associated with fluid circulation induced strong mineralogical and rheological changes, forming discontinuities in mechanical anisotropy. During and post-deposition of the Athabasca Basin after 1.80 Ga, these zones of anisotropy localized brittle reactivation, expressed by a network of micro-fractures later amplified by dissolution processes which enhanced porosity later filled with phyllosilicates and uranium oxides. Cross-cutting relationships between alteration minerals and structures indicate that fluid circulation was active after the basement exhumation. Uranium-bearing fluids moved through the network of micro-fractures. As shown for the Spitfire prospect, fertile structures in the basement below the Athabasca Basin have a combined poly-phase structural and alteration history during which development of ductile shear zones followed by brittle reactivation and dissolution processes led to the formation of superimposed shear and damaged zones in which uranium orebodies are located. Thematic collection: This article is part of the Uranium Fluid Pathways collection available at: https://www.lyellcollection.org/cc/uranium-fluid-pathways

CLASSIFICATION AND IDENTIFICATION OF ARTIFICIAL LAKES BASED ON NATIONAL GEOGRAPHIC-CONDITIONS DATA

Abstract. In recent years, the issue of violations or over-exploitation in artificial lake projects have attracted gradual concern. In the initial stage, in order to determine whether there are violations or over-exploitation in the artificial lake project, it is necessary to accurately identify the status of artificial lakes. Because of the relative lack of water resources along the Yellow River, issues such as the contradiction between supply and demand as well as the protection of ecological environment have become increasingly prominent. Besides, the situation of development of artificial lakes along the Yellow River has become serious, increasing the pressure of utilizing water resources along the Yellow River. Therefore, the identification of status of artificial lake is of great significance in ecological supervision of the Yellow River.Under this context, this paper takes the Yellow River as the research area. Based on the land cover data in the multi-temporal geographic national conditions, using spatial analysis, automatic identification and manual differentiation etc., to develop a rapid classification system of artificial lakes to classify the artificial lakes along the Yellow River, tracking and analyzing its annual changes, and finally establishing an artificial lake classification database and an artificial lake change database. Realizing the effective identification and supervision of changes in the artificial lake. Through experiments and analysis of existing data, this paper summarizes a set of indicators for determining the characteristics of artificial lakes, and proposes a set of effective artificial lake identification approaches. It provides an important basis for the follow-up supervision of artificial lake, and also establishes a basic framework for identifying other surface geographic-conditions, which has important theoretical and practical significance in the application of national geographic-conditions data.

The cultural and political ecology of reed-cane craftsmanship in Lake Eber

The current study examines the interactions of people living around Lake Eber with the lake and their use of it from a cultural and political ecology perspective. In this context, fieldworks were carried out in different periods of 2018-2019. At the same time, observations and interviews covering the research subject were carried out. In the study, it was determined that aquatic plants such as common reed, reedmace, lakeshore bulrush and common cattail are cut from the Lake Eber and are used as building materials and in the production of rush mats, beach umbrellas, prayer rugs, reed pillows, floor mats (straw) and tomb mats. On the other hand, it was observed that the interest in reed-cane craftsmanship and the production of reed-cane products is decreasing every year. This is caused by drought, pollution and eutrophication processes seen in the lake. Based on the results of the study, we suggest that more field studies should be done to examine the factors that threaten the lake ecology and projects should be conducted to improve the situation in the lake.

Structural Controls of Uranium Mineralization in the Basement of the Athabasca Basin, Saskatchewan, Canada

The occurrence of unconformity-related uranium mineralization requires the combination of three components: fluids with the right composition, geochemical traps with the right agents that produce precipitation, and structural traps with the right geometry. In the Athabasca Basin unconformity-related uranium deposits, while basinal brines are commonly accepted as the principal mineralized fluids and graphite and gases (CH4, CO2, and H2S) are well known as the reductants, only few case studies describing structural traps are published. A number of recent works, including numerical modelling, have improved the understanding of the role of inherited shear zones on fluid flow and the development of uranium deposits at a micro- and regional-scale. Nevertheless, there is still a lack of knowledge about the meso- or deposit-scale structural controls that lead to the present (and potentially predictive) localization of uranium deposits along a given shear zone. The present work examines new structural data from drill holes and deals with (i) the identification of mesoscale structural traps that lead to the formation of the Athabasca unconformity-related uranium deposits hosted within the basement and (ii) with the understanding of the role and mode of reactivation of the inherited shear zones. The Sue deposits (McClean Project), the Tri-Island showing (Martin Lake Project) in the Eastern Athabasca, and the Spitfire prospect (Hook Lake Project) in the Western Athabasca have been selected for a detailed analysis of structures and related uranium mineralization. The structural analysis performed brings new insights about the mesoscale structural controls, the role the inherited ductile fabric had on the mode of brittle reactivation and to trap mineralization, and the tectonic regime to which basement-hosted uranium deposits may be associated in the Athabasca Basin.

River Turtles and One Dam Lake: Two Imperiled Graptemys Species in the Pearl River and Potential Impacts of the Proposed One Lake Project

The impacts of human modifications of rivers and associated riverine fauna are well documented, especially following the construction of impoundments. In the Pearl River system of Mississippi and Louisiana, 2 endemic Graptemys species are found (G. oculifera; G. pearlensis), but little is known of their densities in urban segments near Jackson, Mississippi, even though both are species of conservation concern. I used spotting scopes and binoculars to complete replicated basking surveys for both Graptemys species during the summers of 2017 and 2018 in 5 equidistant segments of the Pearl River and nearby oxbow lakes. Basking densities for both species were generally higher in river segments upstream and downstream of Jackson compared to middle segments. Graptemys oculifera were found in greater densities than G. pearlensis in all segments (14–69-times higher). Graptemys oculifera was found in 4 of the 6 oxbow lakes surveyed, but mean densities decreased 10-fold compared with river segments; G. pearlensis was absent from all oxbow lakes. Densities for a generalist turtle species, Trachemys scripta, increased 35 times in oxbow vs. river habitats. The middle 3 survey segments (∼ 15.9 river kilometers) are inclusive of a proposed river impoundment project—the One Lake Project—for flood control and economic development. Estimates of direct and indirect impacts of this project are sizeable for G. oculifera (direct impact: 1684; indirect: 2129) while estimates for G. pearlensis are lower (direct: 88; indirect: 219). The One Lake Project would surely alter existing riverine processes and will favor generalist turtles such as T. scripta that prefer nonflowing lake settings at the expense of riverine Graptemys species. The One Lake Project would be a major setback to both Graptemys species in and around the project area and would negatively impact the recovery potential of both species.

Relationship between rock physical properties and spectral mineralogy applied to exploration for an unconformity-related uranium deposit (Saskatchewan, Canada)

Infrared (IR) spectroscopy has been used to characterize clay and clay-sized minerals present in drill cores that are associated with unconformity-related uranium deposits. Physical properties have been measured on samples to gain empirical data about the rock types and associated relationships with geophysical survey data. These data can be used to build three-dimensional geological models and constrain geophysical inversions. The objective of this study is to verify whether a relationship exists between rock physical properties and IR spectral mineralogy. Physical properties were measured on 427 core samples collected from the Martin Lake project, which is located in the southeastern Athabasca Basin (Saskatchewan, Canada). Results indicate that resistivity, density, and porosity are correlated to each other, especially within basement units. A comparison of their distribution with the IR spectral mineralogy demonstrates a relationship for each altered and unaltered samples. The samples with low resistivity and density, and high porosity are characterized by the presence of a di-trioctahedral (Al–Mg) chlorite (sudoite) due to the hydrothermal alteration processes. The unaltered samples with higher resistivity and density, and low porosity contain a tri-octahedral (Fe–Mg) chlorite as a result of metamorphic processes. Eleven mineralogical classes can be established based on IR spectroscopy. A percentile-based approach has been proposed and tested to define physical property ranges for each of the classes to predict resistivity and density values downhole.

Geological and Thermal Control of the Hydrothermal System in Northern Yellowstone Lake: Inferences From High‐Resolution Magnetic Surveys

AbstractA multiscale magnetic survey of the northern basin of Yellowstone Lake was undertaken in 2016 as part of the Hydrothermal Dynamics of Yellowstone Lake Project (HD‐YLAKE)—a broad research effort to characterize the cause‐and‐effect relationships between geologic and environmental processes and hydrothermal activity on the lake floor. The magnetic survey includes lake surface, regional aeromagnetic, and near‐bottom autonomous underwater vehicle (AUV) data. The study reveals a strong contrast between the northeastern lake basin, characterized by a regional magnetic low punctuated by stronger local magnetic lows, many of which host hydrothermal vent activity, and the northwestern lake basin with higher‐amplitude magnetic anomalies and no obvious hydrothermal activity or punctuated magnetic lows. The boundary between these two regions is marked by a steep gradient in heat flow and magnetic values, likely reflecting a significant structure within the currently active ~20‐km‐long Eagle Bay‐Lake Hotel fault zone that may be related to the ~2.08‐Ma Huckleberry Ridge caldera rim. Modeling suggests that the broad northeastern magnetic low reflects both a shallower Curie isotherm and widespread hydrothermal activity that has demagnetized the rock. Along the western lake shoreline are sinuous‐shaped, high‐amplitude magnetic anomaly highs, interpreted as lava flow fronts of upper units of the West Thumb rhyolite. The AUV magnetic survey shows decreased magnetization at the periphery of the active Deep Hole hydrothermal vent. We postulate that lower magnetization in the outer zone results from enhanced hydrothermal alteration of rhyolite by hydrothermal condensates while the vapor‐dominated center of the vent is less altered.

土钉墙支护及基坑变形数值模拟——以长沙中建梅溪湖项目为例

土钉墙支护及基坑变形数值模拟——以长沙中建梅溪湖项目为例

土钉墙支护及其应力特征数值模拟分析——以长沙中建梅溪湖项目基坑支护为例

土钉墙支护及其应力特征数值模拟分析——以长沙中建梅溪湖项目基坑支护为例

Collaborative Public Space in China: Two Waterfront Projects, Shanghai and Suzhou

This paper discusses public space in China and explores how theories of public space can be applied to two waterfront projects. As case studies the paper compares two public waterfront projects: The 18 km Jinji Lake project in Suzhou and the 45km Huangpu River waterfront project in Shanghai, both completed in 2018. The Jinji lake development in the heart of Suzhou designed by EDAW later AECOM also boasts inclusive 24/7 access and people centered design. Democratic theory is commonly used in the West to discuss public space however LiminHeearguesthatthediscourseasunderstoodinthewesterndemocratictradition is not adequate for Asian cities (Hee, 2017). Constructing Singapore Public Space, Springer) This paper finds that although the idea of public space in China is argued to be an evolving concpt (Gaubatz, 2008, pp 72-83), notions of democratic participation, Human Centered Design (HCD) and place-making methods are central development policyinChinesecities.Whereastermslikevibrancyandvitalityarecommonlyusedby scholars to evaluate and discuss public space in China, rather than democratic theory, theories from western scholars such as Habermas’s theory of the public sphere are also relevant and collaborative practices between civil society and the state are key to the participatory nature of Chinese public space.

Celanese expanding acetic acid in Texas

Celanese plans to expand its acetic acid capacity in Clear Lake, Texas, from 1.3 million metric tons to 2 million t per year by 2021. The initiative follows an agreement that Celanese signed last month to buy a 365,000 t per year synthesis gas plant from Linde at the site. Acetic acid is made via the carbonylation of methanol with the synthesis gas constituent carbon monoxide. Celanese says the Clear Lake expansion improves its cost structure and will allow it to reduce capacity in Singapore and Nanjing, China, by 600,000 t per year. The company adds that the Clear Lake project will allow for $100 million worth of productivity and efficiency benefits. Celanese recently completed an expansion in Clear Lake for the acetic acid derivative vinyl acetate.

SU BİLGİNLERİ MOGAN GÖLÜ’NDE: YARATICI DRAMA VE YAPILANDIRMACI YAKLAŞIM TEMELLİ BİLİM EĞİTİMİNİN ETKİLİLİĞİ

The purpose of this study is to present the effectiveness of educations of Water Scientists at Mogan Lake Project, supported by TÜBİTAK (The Scientific And Technological Research Council Of Turkey) and to examine the attitudes of students toward science. The study was conducted on 63 fourth grade students in 2016- 2017 school year, in different public schools in Ankara. The study used mixed method research design. Quantitative data were obtained using an achievement test consisting of 15 multiple choice questions and an Attitude Toward Science Scale while qualitative data were obtained through open-ended questions. All statistical analyses for quantitative data were performed through SPSS v.20.0. Qualitative data were analysed using content analysis procedure. According to the results of The Wilcoxon signed-rank test children got significantly higher scores on achivement test and attitudes toward science scale. Content analysis results supported the quantitative data in that after the Project activities children reported their desire to be a scientist, to make scientific research and believed the necessity of science more.

THE AMAZON AS A LOW-COST ARENA IN THE COLD WAR'S GAME OF POWER? THE CASE OF THE AMAZONIAN GREAT LAKES PROJECT (1964-1968)

The article examines an underexplored episode of the Brazilian history in the context of the Cold War: the role of the Hudson Institute in South America and the proposal to create a large lacustrine system in the Amazon domains. From the analysis of official documents and literary registers, some of them little-known from the public, we attempted to identify the existence of a relationship between the aforementioned project and the Cold War systemic agenda and, also, the role of Brazil in this paradigmatic moment of the contemporary history. Evidences did not allow us to point out a clear connection between the Amazon Great Lakes Project and the dynamics of the United States-Soviet Union political disputes, even though they have shown that such an enterprise, if carried out, could make the Hylea a low-cost arena for the achievement of U.S. interests in the Cold War's game of power.