An examination of temporal and spatial variation of water quality across the whole watershed is undertook in this research. It is observed that the seasonal variation is apparent in all of the water quality parameters measured. And the spatial variation of water quality parameters gives us the general ideas that water quality is correlation with the watershed landscape. / An integrated approach involving Remote Sensing (RS) technology, Geographic Information System (GIS), Statistical and Spatial Analysis, as well as hydrologic modeling is put forward to perf0ll11 a comprehensive study on the relationship between land use-land cover and water quality in Wenyu River Watershed. Landsat TM data is used to extract land use-land cover information of the study area; while Arc Hydro model is employed to perform the stream network tracing and watershed delineation. / Based on an exponential model, separate multiple regression models are developed to estimate the contributions of different land types on six stream water quality variables, including TN, NO3- N, TP, PO4- P, COD and DO, in Wenyu River watershed. The resulted models are identified to well explain the water quality variables using land use types. And the goodness-of-fit of these modles are reasonably satisfactory. / Finally, this research also discusses the future-oriented studies: l) Higher resolution remote sensing imagery and more in-situ water quality data will be employed to improve the models with higher degree of "goodness of fit" in linking land uses and water quality. 2) Except LULC-related variables, other controlling factors will be considered to establish the more rigorous linkage models. 3) Identifying the relationship between the buffer landscape and stream water quality will be another subject of the future study. 4) Estimating the links between land use-land cover and water quality over an extended period is crucially important job in the future works. (Abstract shortened by UMI.) / The above results and analysis provide insight into the linkages between land-use practices and stream water quality, and the developed models can help in examining the relative sensitivity of water quality variables to alterations in land use made within a watershed. The predicted values are close to the actual monitored values, which indicates that with little calibration and validation, the regression model can be used in another watershed under a different geographical scale, in a different region with variable landscapes. / The results of water quality comparison between different land-use structures tell us that land use types are significantly correlated to water quality variables in Wenyu River Watershed. And the Spearman's rank correlation analyses verify this conclusion, and reveal that urban and village have strong positive relationships with the water quality variables of total nitrogen (TN), total phosphorous (TP), phosphate (PO4-P) and chemical oxygen demand (COD). On the contrary, forest land represents the negative correlation with all the above variables and only positively correlates with dissolved oxygen (DO), which demenstrates that forest land is acting as a "sink" or active transformation zone. / The study offers supporting evidence for previous studies and can serve as a reference to similar studies estimating the response of water quality to the land use-land cover change. The results also indicate that with the integration of GIS and ecological modeling, a decision-making support system can be developed to manage land development and control non-point sources pollution at the watershed scales. This study also suggests that if we pursue a sustainable development, the land management with respect to its development must consider the further erosion on water quality in this area. / Wang, Yufei. / Adviser: Yuanzhi Zhang. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 123-136). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_344865 |
| Date | January 2011 |
| Contributors | Wang, Yufei, Chinese University of Hong Kong Graduate School. Division of Earth System and GeoInformation Science. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, theses |
| Format | electronic resource, microform, microfiche, 1 online resource (xiii, 136 leaves : ill. (chiefly col.), maps (some col.)) |
| Coverage | China, Wenyu River Watershed, China, Wenyu River Watershed, China, Beijing, China, Wenyu River Watershed |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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