Dissertations / Theses on the topic 'Subalpine lakes'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 15 dissertations / theses for your research on the topic 'Subalpine lakes.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Epstein, David M. "15N Tracer and Modeling Analyses of Nutrient Transport Through Lakes in a Subalpine Watershed." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/932.
Full textWinn, Neil Thomas. "Modeling Dissolved Organic Carbon (DOC) in Subalpine and Alpine Lakes With GIS and Remote Sensing." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1209058548.
Full textSalimi, Shokoufeh. "Quantifying CO2 emissions from lakes and ponds in a large subarctic catchment." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-82963.
Full textPATELLI, MARTINA. "ZOOPLANKTONIC POPULATION DYNAMICS AND PELAGIC FOOD WEBS IN THE DEEPEST SUBALPINE LAKES RELATED TO ANTHROPOGENIC PRESSURE AND CLIMATE CHANGE." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/262346.
Full textClimate change is considered to be one of the most severe threats to earth and aquatic ecosystems and the concern about the effects that global warming can have on biological communities is growing. Even if the number of studies concerning climate change is worldwide increasing the effects of climate change are challenging to monitor and understand because of the multitude of responses within an ecosystem. In the last years, analyses of long-term data sets provide increasing evidence on the sensitivity of water bodies to climatic fluctuation. Small size and fast reproducing zooplankton organisms are sensitive to environmental change. Moreover, they represent key components of aquatic food webs, connecting primary producers to big secondary consumers as fishes. The purpose of the present PhD research is to expand the knowledge on the zooplankton communities of the large and deep lakes south of the Alps, detecting trends and significant change or shift in the pelagic food webs structure due to global or local impacts. The analysis of long-term series of limnological observations and a paleolimnological study on lake sediment have been combined in order to disentangle the effects of climate change from that due to more local and anthropic stressor as eutrophication. The obtained results suggested that in deep subalpine lakes the effect of climate change on pelagic food webs components is complex, including several direct and indirect effects, and it is mediated by nutrient availability. In particular, in deep lakes winter climatic variability trigger a cascading effect that involves the entire lake ecosystems, modifying lake chemical, physical and biological characteristic. The effects of warmer winter temperature can reverberate on zooplankton seasonal patterns until summer, affecting the food webs functioning. The paleolimnological investigation, through the combined study of biotic and abiotic factor, allowed clarifying the synergic effects of the most important drivers of change in lake ecosystems, suggesting that climatic factors should be considered with nutrient availability as a determinant element in controlling the temporal development of plankton communities and pelagic food web structure.
Goodman, Keli J. "The Effect of In-Line Lakes on Dissolved Organic Matter Dynamics in Mountain Streams." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/702.
Full textBraekevelt, Eric. "Effects of suspended glacial particles on the bioavailability of hydrophobic organic contaminants in two subalpine lakes in the Canadian Rocky Mountains." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60416.pdf.
Full textBeaty, Myron H. "Limnological investigations of a natural, subalpine lake in the early stages of eutrophication : Mountain Lake, Giles County, Virginia /." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-163934/.
Full textNanus, Leora. "Regional assessment of the sources and effects of acidic deposition on lake chemistry in alpine and subalpine watersheds of National Parks in the Rocky Mountains, United States." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3315793.
Full textReinemann, Scott A. "Holocene Climate and Environmental Change in the Great Basin of the Western United States: A Paleolimnological Approach." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1372764346.
Full textCAPELLI, CAMILLA. "Toxin-producing cyanobacteria in the large lakes south of the Alps: detection of new producers and molecular identification methods." Doctoral thesis, 2017. http://hdl.handle.net/2158/1081392.
Full textCheng, Wei-yuan, and 鄭為元. "Using water quality variables to establish light attenuation model in subtropical subalpine lakes - Case study in the Yuan-Yang Lake and Emerald Peak Lake." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74398185226519203830.
Full text國立聯合大學
土木與防災工程學系碩士班
98
In the lake ecosystem, Light attenuation coefficient (Ke) does not only impact the planktonic algae, aquatic plant growth, and reproduction, but also determines the zooplankton and fish predation. The attenuation of sunlight includes absorbs and scatters in the lake, therefore the light attenuation coefficient in water column to certain extent lake biology, hydrology, and water chemistry elements of a comprehensive response. The purpose of present study is to understand light attenuation property in the Yuan-Yang Lake and Emerald Peak Lake. Field measurements were conducted from April 2008 to March 2010 in the Yuan-Yang Lake. Single-variable regression analysis showed that Ke and the inverse of Secchi disk depth (1/SD) yield the best correlation (R2=0.576), indicating the 1/SD might be a good variable for predicting water column light attenuation coefficient in the Yuan-Yang Lake. The regression between Ke and total suspended solids (TSS) yields a good correlation (R2=0.575), and regression between Ke and chlorophyll-a concentration yields a poor correlation (R2=0.256). We also conducted the multiple-regression analysis for the Ke, chlorophyll-a (Chl), and total suspended solids (TSS) in the Yuan-Yang Lake. The multi-variable regression can be expressed by Ke = 1.172 + 0.610‧Chl + 0.544‧TSS (R2 = 0.44). The model was applied to validate the other set of data and showed that the RMSE (Root Mean Square Error) and MAE (Mean Absolute Error) values between the observed and predicted results are 2.35m-1 and 1.47 m-1, respectively. Field measurements were also conducted from November 2009 to May 2010 in the Emerald Peak Lake. The single-variable regression analysis showed that Ke and the inverse of Secchi disk depth (1/SD) yield the best correlation (R2=0.645), indicating the 1/SD might be a good variable for predicting water column light attenuation coefficient in the Emerald Peak Lake. The regression between Ke and chlorophyll-a concentration yields a good correlation (R2=0.516), and regression between Ke and total suspended solids (TSS) yields a poor correlation (R2=0.202). We implemented the multiple-regression analysis for the Ke, chlorophyll-a, and total suspended solids (TSS) in the Emerald Peak Lake. The multi-variable regression can be expressed by Ke= 6.051 + 0.026‧Chl - 0.134‧TSS (R2 = 0.47). The results revealed that the background light attenuation coefficients, K(w + DOC), are 6.051m-1 and 1.172m-1 in the Yuan-Yang Lake and Emerald Peak Lake, respectively. It showed that the background light attenuation coefficient in the Emerald Peak Lake exhibits the significant influence on the Ke value comparing to the Yuan-Yang Lake.
Milan, Manuela. "Long-term development of subalpine lakes : effects of nutrients, climate and hydrological variability as assessed by biological and geochemical sediment proxies." Doctoral thesis, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-115188.
Full textPalmer, Samantha Louise. "Subfossil chironomids (insecta: diptera) and climatic change at high elevation lakes in the Engelmann spruce-subalpine fir zone in southwestern British Columbia." Thesis, 1998. http://hdl.handle.net/2429/8196.
Full textLin, Hao-Hua, and 林皓華. "Three-dimensional Water Quality Modeling in the Subalpine Lake of Taiwan ─ Case Study of Tsuei-Feng Lake." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/h4zcpy.
Full text國立聯合大學
土木與防災工程學系碩士班
106
In recent years, anthropogenic and natural pollution resources were increasing gradually. For instance, the nutrients caused by such activity of agriculture or tourism flow into lakes with the runoff which results from rainstorm. Subsequently, they have direct or indirect effects on the water quality of lakes and, thereby, cause eutrophication. In this study, a simulation concerning the conditions of hydrodynamic and water quality of Tsuei-Feng Lake, a subalpine lake, was conducted using a three-dimensional model of hydrodynamic and water quality. In addition, the calibration and validation of the model were conducted with the observational data (i.e., water level, temperature, and water quality) collected from January 2010 to July 2011. The results demonstrate that there the wimulations reproduce the observational data. After model calibration and validation, it was further used to do the sensitivity analysis of parameters. The results show that growth rate of algae has the strongest effect on concentration of chlorophyll a. Also, the model was used to explore the influence of wind stress on the temperature and water quality. Consequently, to explore, three simulation scenarios were set in the model applications. The results show that wind stress has a significant influence on surface flow field, water temperature, and water quality of Tsuei-Feng Lake. The study also displayed showed the results of pollution reducing by 50% and 90%. Especially, if the pollution was reduced by 90%, the concentration of chlorophyll a would decrease to less than 10 μg/L, even lower than 4 μg/L; namely, the lake would perform the state of mesotrophic/oligotrophic status according to the water quality. Besides, the effects of flow differences on lake water quality were discussed. The simulated results show that when the lake flow rate increases from 0.98 to 9.6 m3/s, the concentration of chlorophyll a obviously decreases from 146 to 98 μg/L. In the other words, the concentration of polluted water can be reduced by high flow rate.
Shieh, Wan-Lin, and 謝宛霖. "Modeling Hydrodynamic And Water Quality In The Subalpine Yuan-Yang Lake Using Three-Dimensional Model." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/57290053770818035221.
Full text國立聯合大學
土木與防災工程學系碩士班
102
Eutrophication refers a large amount of nitrogen, phosphorus, and other nutrients in the lakes, reservoirs, and estuaries under the natural and anthropogenic conditions so that algae and plankton are rapid growth within a certain time, resulting in the decreasing dissolved oxygen in water column, death of aquatic organisms due to hypoxia, and water quality deterioration. It contains a series of complex physical, chemical, and biological processes. Water quality model is an important tool for assessing water quality and ecosystem in the lakes. The changes of external environment and the internal interaction in the water quality and ecosystem can be evaluated by models. Water quality model is also the best tool for lake management. In the present study, a three-dimensional model is established and applied to simulate the hydrodynamic and water quality conditions in the subalpine Yuan-Yang Lake. The observational data were collected from June 2009 to May 2010 and adopted for model calibration and verification. The results indicate that the simulated and observed water level, water temperature, and water quality are in good agreement. The validated model was then applied to investigate the physical and biochemical processes in the lake. The model sensitivity shows that the algae maximum growth rate is an important parameter to affect chlorophyll a concentration. When the wind stress increases, current field at the surface layer, water temperature, and water quality will be significantly influenced. The nitrogen and phosphorus loads reduced 50% were used to investigate the effects of non-point source reduction in the watershed on chlorophyll a concentration. The modeling results reveal that the effect of a 50% phosphorus loading reduction on chlorophyll a concentration is more significant, therefore the Yuan-Yang Lake is subjected to phosphorus control. The model was also applied to probe the effect of climate change on water quality. The simulated results indicate that chlorophyll a concentration will increase 25.77 % and 7.7 % for the medium-term and long-term climate change conditions, respectively, due to the decrease of surface runoff. It means that the water quality in the lake will get worse in the future.