Dissertation > Excellent graduate degree dissertation topics show

Loess Hilly Area area estimation methods

Author: Yuan
Tutor: Yang
School: Inner Mongolia University
Course: Ecology
Keywords: In Loess Hilly Region Valley Surface area Estimate
CLC: S159.2
Type: Master's thesis
Year: 2009
Downloads: 84
Quote: 0
Read: Download Dissertation

Abstract


Different levels, different developmental stages of the valley is an important feature of the loess landscapes. Occurrence, growth and development of the valley and is closely related to the evolution of the Loess Plateau. The formation and development of the valley by the terrain, vegetation, precipitation and other factors, its existence will react on the terrain, vegetation, water, heat and other factors gradually formed intrazonal niche, thus affecting the ecology of the region as a whole process. Due to the the unique landforms structure of the valley of the ups and downs, so study how to efficiently and accurately obtain the actual area of ??the valley (ie the valley of the surface area) urgent need for research work. In this study, by typical watershed in Loess Hilly Region - the Huangfu Hustle domain of typical test area, the Small Watershed Wufendigou high-resolution images and DEM data analysis, simple estimate based remote sensing image valley surface area gully development and the study area as well as the actual valley area of ??the watershed biomass and ecological water a preliminary study, and its structure is as follows: 1. Huangfuchuan watershed, all of the channel can be divided into seven. Relational expressions is more compact, the channel level descending its total length and the channel gully relationship between the number can be represented as: Y 1 = 35.18 * e 0.678x , R 2 = 0.999Y 2 = 0.256 * e 1.568x , R 2 = 0.997 where Y 1 is the total length of a one-channel, the Y- 2 a level valley number, x is the corresponding gully Descending level. The inherent law of gully development of these intrinsic factors is the the estimation formula established by the Institute to be established. 2. Proposed valley area estimation formula based on remote sensing image information: LN (S p ) = 1.012 * LN (L) 5.079LN (S s < / sub>) = 1.012 * LN (L) 5.234-S p for the valley projected area, S s valley surface area, L The gullies length. The derivation of this formula obtained gully surface area estimated coefficient of 1.1677, and the estimate of the surface area of ??gully slope coefficient of 1.2008. Using the estimated coefficients calculate the Huangfuchuan basin surface area than the increase in the projected area of ??276.52 square kilometers. Model application can be used the way of manual identification, extraction of remote sensing image River valley length to estimate the corresponding area of ??the valley. In the case of the degree of crack known basin cutting basin surface area, can be used to estimate coefficient calculation. May be used in the case of a known slope plaque of the projected area of ??the concrete ditch to the surface area of ??the trench slope estimation coefficient calculating the surface area of ??the corresponding plaque. Using established estimating equations with estimated conversion factor, a simple estimation of the vegetation of the study area several main gully slope gully surface area estimates, basin-wide increase in dry matter yield of 19,118.6 tons, ecological water increase of 46.72 million tons, visible ecological effects of the valley is extremely significant.

Related Dissertations

  1. Endophytic Fungal Diversity and Their Secodary Metabolites of Eleven Dominant Plant Species in the Dry-hot Valley of Yuanjiang, Yunnan Province, China,X172
  2. Thinking of the Valley Shizhe academic and clinical experience and Treating depression,R249.2
  3. Study on the Effect of Creatine Monohydrates on Carcass Composition, Meat Quality and Energy Metabolism of Postmortem Muscle in Duck,S834.5
  4. Engineering Design on the Treatment and Reuse of Coal Mine Drainage,X752
  5. Estimation of Differential Quantities on Point Clouds and Applications,TP391.41
  6. Discover for Universities Involved in the Exploration of Rare-Earth Hi-Tech Zone,G649.2
  7. Material substance of the performance of contemporary architecture,TU-0
  8. Indoor air purifiers developed high voltage power supply,TN86
  9. Switched Reluctance Motor Direct Torque Control of instantaneous,TM352
  10. Context of climate change and recession valley spruce-fir forest pests correlation,S763
  11. Yanan City loess landslide stability,P642.22
  12. Preparation of high surface area activated carbon , forming and preliminary application,TQ424.1
  13. Strain-based graphene nanodevices design,TB383.1
  14. Research on Cement Concrete Overlay Stress Analysis and Cracking Prediction in the Rubblization of Old Cement Concrete Pavement,U416.216
  15. Estimation Model of Asphalt Content for SAMPAVE Stress Absorbing Layer Mixture,U414
  16. Study on Effect of Enclosing Forest in Valley Forest of Fuhai County,S755
  17. Layout and Evolution of Routes in Huai He Valley during Qing Dynasty,K249
  18. Research on Activity-Based Cost Estimation of Marine Engineering Equipment Products Based on BOM,F406.72
  19. HN CCB the Provident Fund extract repayment project cost management research,F832.4
  20. Research on Competitiveness of High-tech Industry in Optics Valley of China,F276.44
  21. The Study of the Conflicts between the Aojiang River Valley’s Regional Economic Integration and Its Administrative Division,F127

CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil geography, soil survey > Chinese soil geography, soil survey
© 2012 www.DissertationTopic.Net  Mobile