TheEffectofUrbanizationinthesurfacewaterrunoff：城市化對地表徑流的影響課件

1、The Effect of Urbanization to the surface-water runoffThe comparison between the urbanized and undeveloped zones第1頁，共16頁。Outline Objective/Study area Data Sources Backgrounds Map Creation Analysis Question第2頁，共16頁。 Build a Basemap of the City of Austin Apply the precipitation data (time-series) on t

2、he study areas Compare the flow pattern in regards to the land coverObjective第3頁，共16頁。Study AreasThe Shoal CreekThe Barton Creek第4頁，共16頁。1. Aerial Photo: Texas Natural Resources Information tnris.state.tx.us/update3.cfm?Tx_County_Name=Travis 2. Land Cover: National Land Cover Institute 3. Digital El

3、evation Model: USGS Dataset 4. Gage station data: USGS Dataset /GIS/metadata/usgswrd/XML/streamgages.xml 5. Stream Network data: City of Austin GIS Data Sets ftp:/coageoid01.ci.austin.tx.us/GIS-Data/Regional/coa_gis.html 6. Precipitation Data: Hourly/Daily Rain Data from NOAAs Forecast Systems /hour

4、ly_precip.html Data Sources第5頁，共16頁。BackgroundThe sources of flooding in Austin areaUnique geographic and atmospheric conditionCreeksUrban floodingHurricane and tropical storms第6頁，共16頁。The Land Cover of Austin, Texas第7頁，共16頁。Building a BasemapWatershed of both creeks第8頁，共16頁。The completed Basemap第9頁

5、，共16頁。Gathering discharge and precipitation dataUSGS Streamgage dataPrecipitation data第10頁，共16頁。AnalysisSep. 7, 2019Sep. 2019Loop 360SH71Barton SpringBarton LostShoalDayDischarge (cfs)60.00 5.40 2.44 5.60 0.00 70.01 6.70 2.49 7.60 81.00 第11頁，共16頁。AnalysisSep. 2019Loop 360SH71Barton SpringBarton Lost

6、ShoalDayDischarge (cfs)70.01 6.70 2.49 7.60 81.00 80.00 20.00 2.52 14.00 212.00 Sep. 8, 2019第12頁，共16頁。AnalysisSep. 2019Loop 360SH71Barton SpringBarton LostShoalDayDischarge (cfs)80.00 20.00 2.52 14.00 212.00 90.00 32.00 2.53 33.00 9.10 Sep. 9, 2019第13頁，共16頁。Analysis第14頁，共16頁。ConclusionThe land cover largely influences the discharge rate and