Bayou Chene and Lacassine Bayou in southwestern Louisiana are not meeting their designated use for fish and wildlife propagation and are included on the 303(d) list of impaired water bodies. The TMDL for DO in Lacassine Bayou was approved on February 25, 2000, and the TMDL for DO in Bayou Chene was approved on July 12, 2002. This study assessed seasonal trends in surface water quality, along with spatial trends in soil particle-size distribution and chemistry, in the watersheds of Bayou Chene and Lacassine Bayou. It also investigated the relationship between soil particle-size distribution and surface water quality and the relationship between land use types and surface water quality in the two watersheds. The methodology was composed of three parts: surface water quality monitoring was conducted during the rice growing season; soil samples were collected and analyzed for particle-size distribution and chemistry; and geospatial and statistical analyses were performed to assess the relationships between soil particle-size distribution, land use types, and surface water quality. Time series plots suggest that the decrease in DO between March 6, 2014 and June 1, 2014 is related to increases in temperature and turbidity. Soil particle-size distribution prediction maps, analysis of land use data, and surface water quality statistics suggest that greater turbidity, TSS, and TCS in the Bayou Chene watershed is related to a greater proportion of silt in soils and greater proportions of land used for rice, soybeans, and aquaculture (crawfish) production in that watershed. Future work should include more extensive soil sampling and year-round surface water quality monitoring to improve the validity of the geospatial and statistical analysis.
|Advisor:||Poudel, Durga D.|
|Commitee:||Borrok, David M., Duex, Timothy W., Poudel, Durga D.|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 54/06M(E), Masters Abstracts International|
|Subjects:||Hydrologic sciences, Environmental Geology, Environmental science|
|Keywords:||Land use, Nonpoint source pollution, Silt, Soil erosion, Soil particle-size distribution, Surface water quality|
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