Carson City Nevada Gis Data
Wood Rodgers, Inc. is looking for a GIS Technician to provide GIS support to a variety of Wood Rodgers, google.com, Nevada, United States GIS Manager to coordinate and perform GIS tasks; designing, creating, and developing spatial data sets Volunteer: Sustainable Climate Environment Advocate Carson City NV. These data were processed using remote sensing and GIS tools and then . the studied river belongs, is located in the occidental High-Atlas of Marrakech city. .. deposition during extreme flood conditions on the Carson River, Nevada. Five-digit county FIPS codes and U.S. county names in Esri Data. The FIPS county county equivalents. The current Esri Data version are from Census
Bing Maps parks data is somewhat better but still not complete or accurate for California. In the future, we may include these, but for now, please avoid including recreation sites that have more than half their total land area in carson city nevada gis data.
CPAD includes publicly owned golf courses not privately owned courses and some publicly owned cemeteries - these are all flagged in the CPAD database.
Oruse the Edit button to click an area on the map and submit a recommended edit. To add an area by uploading data, use the "Upload Data" section below.
Select file to upload: Shapefiles must be zipped and include valid. Start by uploading a file from your computer. Please describe this dataset with a brief title and a more detailed description. File Uploads Uploaded files. Link or share via email: Your download is ready. Many studies have analyzed channel changes with aerial imagery many examples are reviewed in Lawler, In this study we have used Landsat images instead because they are free to use and available worldwide.
Landsat images from andcollected from the archive of Landsat available on the Earth Explorer platform of the United States Geological Survey USGS,are used to highlight and study the destruction of river banks.
The images used for this study are coherent in terms of being collected during a sunny acquisition period between June and August. Images taken during the sunny months show a very good contrast between image objects Jensen, and this is fundamental in landscape-change detection studies in order to display the bare soil, water limit and vegetation cover.
Previous studies Gurnell et al. However, the typical GIS approach to planform changes has the problem that it is limited to two dimensions Rhoades et al. Measurement of lateral erosion of rivers requires the third dimension of bank height, which is unavailable Carroll et al To overcome this problem, some authors Rhoades et al. However, airborne LIDAR data not only have a high cost but also are unavailable for many areas, including our study carson city nevada gis data, which is a major challenge.
Carson city nevada gis data order to solve this situation, in the present study, we have used high-resolution We chose this data because of its high resolution We used Landsat images Fig. Landsat carson city nevada gis data from and were used to draw bank boundaries.
They were digitized as lines over the entire length of the river. To simplify bank limit digitization, banks were delimited based on the location of agricultural land cover Fig. In order to identify bank retreat formulas 1 and 2we calculated the difference between the and bank positions Fig.
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The intersection between bank positions also provides polygons, which are named erosional areas Fig. The area and length were then calculated for each erosional area. Moreover, the channel lateral migration can be estimated by dividing each erosional area by its length as in formula 1 :. The width of erosional areas calculated by Formula 1 is divided by the period of study 32 years in this study and then provides the rate of bank retreat Rhoades et al.
To estimate the bank heights of the Rdat River, more than 20 20 to 30 depending on the area of each polygon profiles were drawn over each erosional area along the entire length of the river Fig. In fact, the number of profiles depends on the erosional area lengths.
The profiles are drawn so that they are more or less perpendicular to the banks, parallel to one another and evenly spaced 10 to 15 m.
Bank heights were then calculated based on the profile elevation Z as in formula 3 :. On the left: Diagram representing a single profile used to estimate bank heights in the considered area. When the bank height has been calculated for each profile, the height of the whole erosional area is then estimated formula 4 :.
Also, to find the total volume m 3 of soil removed by river bank erosion in Rdat River Fig. Different field missions to different locations along the river were also carried out in order to visualize and analyze the problem of bank erosion in the field of study.
In addition, to validate the obtained results, which is the main purpose of the field research proofs, bank heights were measured manually in the field and compared with those estimated by the GIS algorithm, using a correlation test correlation coefficient between two variablesof the extracted and measured bank heights in order to define the state of the relationship between the two measured variables.
The comparison of the and images Fig. The remarkable disappearance of vegetation cover represented in red observed in the imagery is a result of river bank erosion due to devastating floods which the study area has seen during the period of study.
Digitization of the bank boundaries indicated that there are many more than individual eroding banks along the Rdat River from upstream to downstream.
These erosional areas range between In addition, we noticed that further down the river course, eroded banks become more noticeable. The width of the eroded area becomes larger. Thus, the high peak of erosional areas is located at the lower reaches. Comparing the carson city nevada gis data integration of the chord length Fig. The width of erosional areas formula 1 and Fig. The width of erosional areas reaches up to River bank retreat rates along the Km study reach over the year study period are remarkably variable and range from 0.
The observed bank heights in the field in carson city nevada gis data south of the river downstream were measured and compared to bank heights extracted using the correlation test significance of correlation. The results, illustrated in Fig. R: coefficient of determination; P: p-value. The blue line represents the moving average based on the bank height observed in the field.
Bank height is carson city nevada gis data variable from one erosional area to another. It ranges between 0. Obviously, spatial variation in bank height tends to be important at Rdat River, with a large frequency of the higher values; 2 to 3.
We calculated the bank height for each eroded area, which made the volume calculated more accurate than that obtained by defining an average bank for the entire river. The multiplication of the bank heights by the surface of eroded areas gives us the volume of sediment eroded along the studied river. It varies from 0. The volumetric erosion rates range from 3.
The volume of carson city nevada gis data sediment increases significantly from the upper to the lower reaches of the river: it starts to increase after 5 Km downstream Fig.
The considered changes in bank erosion rates are mainly located in the downstream part of the river, as mentioned by Lawler et al. In this study, the results also show that the erosion of river banks becomes more important downstream: the erosional areas become larger Fig. The slopes Fig. At this point, many meanders have developed over time. Field study indicates that carson city nevada gis data erosion is not the only process causing the degradation of river banks.
We found carson city nevada gis data the landslide after a quick drop in the water level and the collapse may also affect river banks. In addition, when overbank flow occurs, considerable damage is detected due to flooding along the studied river including erosion of banks as well as damage to crops planted on the alluvial plain Fig.
This area is an important agricultural region for the residents who live along the river. Landsat images helped us to define the river bank limits based on detection of changes in vegetation cover. GIS data allowed us to extract the maximum of the erosional area and to calculate the river bank retreat and heights along the entire Rdat River during the last 32 years.
Subsequently, field measurements were used to validate the extracted bank heights based on our approach. The bank retreat rates reach a maximum of 5. The height of river banks is very variable, ranging from less than 1 m to several meters.
Given these large numbers, we estimate that river bank erosion is widely contributing to the sediment supply of the studied river, with an average volumetric erosion rate of Unfortunately, there are no gauges on the river of Rdat basin to validate this value. Actually, our main motivation to study this river is to understand more this issue of river bank river erosion and its impacts in order to help the deciders make a move and maybe then we might have a chance to install a gauges in this river and manage this river.
The sediments released in the river when eroded from banks might have several environmental impacts. These can be a source of contaminated sediments; for example, a source of phosphorus P results from the loss of agricultural lands.
River bank retreat rates along the Km study reach over the year study period are remarkably variable and range from 0. The observed bank heights in the field in the south of the river downstream were measured and compared to bank heights extracted using the correlation test significance of correlation. The results, illustrated in Fig. The blue line represents the moving average based on the bank height observed in the field. Bank height is highly variable from one erosional area to another.
It ranges between 0. Obviously, spatial variation in bank height tends to be important at Rdat River, with a large frequency of the higher values; 2 to 3. We calculated the bank height for each eroded area, which made the volume calculated more accurate than that obtained by defining an average bank for the entire river. The multiplication of the bank heights by the surface of eroded areas gives us the volume of sediment eroded along the studied river.
It varies from 0. The volumetric erosion rates range from 3. The volume of eroded sediment increases significantly from the upper to the lower reaches of the river: A volume of eroded sediment; B volumetric erosion rates along Rdat River from the upper left to the lower right reaches. The considered changes in bank erosion rates are mainly located in carson city nevada gis data downstream part of the river, as mentioned by Lawler et al. In this study, the results also show that the erosion of river banks becomes more important downstream: At this point, many meanders have developed over time.
Field study indicates that the erosion is not the only process causing the degradation of river banks. We carson city nevada gis data that the landslide after a quick drop in the water level and the collapse may also affect river banks. In addition, when overbank flow occurs, considerable damage is detected due to flooding along the studied river including erosion of banks as well as damage to crops planted on the alluvial plain Fig.
This area is an important agricultural region for the residents who live along the river. Landsat images helped us to define the river bank limits based on detection of changes in vegetation cover. GIS data allowed us to extract the maximum of the erosional area and to calculate the river bank retreat and heights along the entire Rdat River during the last 32 years.
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Subsequently, field measurements were used to validate the extracted bank heights based on our approach. The bank retreat rates reach a maximum of 5. The height of river banks is very variable, ranging from less than 1 m to several meters. Given these large numbers, we estimate that river bank erosion is widely contributing to the sediment supply of the studied river, with an average volumetric erosion rate of Unfortunately, there are no gauges on the river of Rdat basin to validate this value.
Actually, our main motivation to study this river is to understand more this issue of river bank river erosion and its impacts in order to help the deciders make a move and maybe then we carson city nevada gis data have a chance to install a gauges in this river and manage this river. The sediments released in the river when eroded from banks might have several environmental impacts.
These can be a source of contaminated sediments; for example, a source of phosphorus P results from the loss of agricultural lands. Thus, the accumulation of sediments in the river may increase environmental problems Roslan et al. Moreover, taking into consideration the important volume of sediments When heavy rains arrive in the basin, the river will need to evacuate, under all and any circumstances, its liquid and solid flow.
To do so, it needs more space, so it will adopt a new geometric shape and then erosion of banks and the phenomenon of flooding of the alluvial carson city nevada gis data will increase. Erosion of banks is a serious agricultural problem within fluvial ecosystems in semi-arid regions such as the case study area of Rdat basin in southeastern Marrakech.
The assessment of river bank erosion and the consequences of bank retreat, which was the main objective of carson city nevada gis data study, is fundamental because of the associated hazards.
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The combination of the field study, Carson city nevada gis data and remote sensing data by our approach led to the conclusion that the river of Rdat basin is significantly unstable and widely contributes to the load of the river. Our developed approach has allowed us carson city nevada gis data successfully extract river bank heights and then calculate the volumetric erosion rates of sediment constituting the river banks.
This approach has given satisfying results. Its advantages are its simplicity and applicability and it may be used instead of methods developed based on expensive carson city nevada gis data e. Moreover, the use of this approach in future studies of other rivers in semi-arid regions will certainly improve the obtained results. In addition, the treatment and the study of free satellite images can prove very useful, either to understand the phenomenon of river banks degradation, or to think about a sustainable management of this natural hazard.
ABSTRACT Bank erosion is the process of detachment of material grains constituting the banks under the effect of river water during flood events in a fluvial system in semi-arid regions, which are characterized by irregular floods.
River; bank height assessment; semi-arid climate; Marrakech; Morocco. RESUMEN La erosión de riberas es el proceso de desprendimiento de los granos materiales que constituyen las orillas de los ríos bajo el efecto del agua. Large shift in source of fine sediment in the Upper Mississippi River.
Environmental Science and Technology, Modeling erosion and overbank deposition during extreme flood conditions on the Carson River, Nevada. Journal of Hydrology, Numerical simulation of bank erosion and channel migration in meandering rivers, Water Resources Research, 32 9: Fluvial geomorphological analysis of the recruitment of large woody debris in the Yalobusha river network, Central Mississippi, USA.
Information from topographic survey. Changing River Channels Gurnell, A. Sediment loads and sources in heavily modified Irish catchments: Channel planform change on the River Dee meanders — An analysis of the processes of river bank erosion.
Manual of Remote Sensing Jensen, J. Journal of Environmental Quality, Assessment of river bank erosion in Southern Minnesota Rivers post European settlement. Analysis of groyne placement on minimizing river bank erosion.
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