代做CVEN 9620 Rivers, Estuaries and Wetiands Assessment 2: River Investigation调试数据库编程

CVEN 9620

Rivers, Estuaries and Wetiands

Assessment 2: River Investigation

Course Learning Outcomes Assessed:

CLO2 : Describe the key physical attributes associated with Rivers, Estuaries, and Wetland systems.

CLO3 : Synthesise and interpret available data for river and estuary systems to compose a high- quality engineering report

CLO4 : Design idealised channels and river systems using both standard engineering design practice and building with nature concepts.

Question Style.:

To assist you, questions have been identified by their level of difficulty and understanding to help guide you on where you sit in the course learning. These can include:

Credit Level - basic to solid understanding of concepts and direct link to what has been done in class.

Distinction Level - these questions require students to expand on what has been learned in class to a more advanced understanding.

High Distinction Level - these questions require students to significantly expand on what has been learned in class, think beyond a defined single answer, make engineering judgements with an advanced understanding.

Overview:

Students will perform. an engineering design and assessment based on river dynamics and river engineering controls. This can include aspects of hydrodynamics as well as river design.

As a recently graduated civil/environmental/water resources engineer, you have been hired by your   local Government (Office of Water and the Environment) to perform. an assessment of an iconic river section and concept design for riverbank protection. For the purpose of this assessment, we will be   studying the Hawkesbury-Nepean River as described below.

WRITTEN REPORT [Total of 100 marks available] Requirements:

The report should be a maximum of 15 pages, single-spaced (not including your title page/cover page, references and appendix) and should only contain the necessary items, including your summary tables, figures/graphs.  Please see the marking rubric for guidance.

A professional style. report is required.  Ensure to structure your report logically as per commonly adopted formats for engineering reports.  This should include appropriate headings and subheadings based on the questions in the assignment brief. Please keep things clearly labelled and in order. Make sure to include references.  Appendices may be referred to for extended material but all assessable details must be in the main body of the report.

The technical assessment should include:

a.         Provide/calculate the technical criteria listed below using available literature/information, if needed, informed engineering judgement. Where insufficient information is available, the   student is expected to make assumptions that may assist in calculating the answer.   [90   marks - see rubric]

b.        Report content is important and reports that solely list a table of answers will be marked

down accordingly.  A written overall assessment based on your technical assessment,

include a summary of your key findings, referring to the tables/figures.  Make sure to

support your technical and geographical assessments with maps, graphs and aerial

imagery where appropriate. Any assumptions should be discussed and highlighted. A graph should only be presented once but can be referred to as many times as needed. [10 marks]

Answer the following questions as part of this assessment:

1.   [15 marks] Use Google Earth, QGIS, or equivalent to determine the following River

characteristics within the Hawkesbury-Nepean River. The map provided here is a reference and should not be used for your calculations.

 

a.   [CR LEVEL] Determine the length, sinuosity and meandering type of the River segments between:

i.   Sackville Ferry to Lower Portland Ferry

ii.   Lower Portland Ferry to Wisemans Ferry

iii.   Wisemans Ferry to Hawkesbury River Hay

b.   [D LEVEL] In your own words (no more than 1 paragraph, ~300 words), making

reference to what you’ve learned in the course and literature review, explain why the river sinuosity may change downstream? What other factors related to the river geomorphology would we expect to change from upstream to downstream?

c.   [HD LEVEL] Discuss the impact of climate change on the geomorphology of

Hawkesbury-Nepean River. If we were to expect more extreme rainfall events in the future (say a doubling of rainfall intensity), how would this change the river characteristics? Why?

2.   [10 marks] Flow regime of the river:

a.   [CR LEVEL] What is the Bank full discharge (provide quantity and reference)?

b.   [CR LEVEL] Using available seasonal rainfall data for the catchment, when would you  consider the highest and lowest freshwater flows? Why? Provide relevant data to back up your answer.

c.   [D LEVEL] In your own words, referring to what you’ve learned in the course and

literature review, explain the impact of longer term (e.g. decades) cycles of freshwater flows on the river geomorphology?

3.   [20 marks] Sediment transport:

 

a.   [D LEVEL] use the cross-section profile to estimate depth, channel area and depth-

averaged velocity under bankfull discharge. Provide the curve between depth and width- depth ratio to support your estimation of the bankfull depth.

b.   [D LEVEL] calculate the critical depth-averaged velocity under bankfull discharge (as   you provided in question 3a), and describe the implication of the calculation results to suspend and bedload sediment transport. You can refer to the sediment grading curve provided in resources for sediment size.

c.   [D LEVEL] Draw secondary flow pattern in this cross-section, and discuss its implication to sediment transport.

4.   [10 marks] River regulation structures:

a.   [D LEVEL] Identify the river regulation structures along the Hawkesbury-Nepean River and describe their impact on the downstream morphology. Describe in no more than a short paragraph.

b.   [HD LEVEL] Discuss the impact of these river regulation structures on downstream coastlines compared to the Elwha River example introduced in class.

5.   [10 marks] Riverbank protection:

a.   [CR LEVEL] Identify and describe river bank protection structures along the

Hawkesbury-Nepean River. Provide at least one example of a structure used for strengthening riverbanks and one for reducing hydrodynamic forces. For each example, explain why these structures are located where they are, detailing their specific functions. Include a Google Earth or Nearmap image to illustrate the location and design of each structure.

b.   (HD LEVEL) Evaluate the feasibility of replacing the hard structures in your examples  with nature-based approaches. Describe what type of nature-based solutions could be designed.

6.   [25 marks] Rip rap design:

This last part asks you to design a riprap protection for the Lower Port Ferry. Your design conditions should be for a 10-year design flood flow peak of 1000 m3/s.

State all other assumptions made and provide references.

a.   [CR Level] Design a simple rip-rap structure, using the USACE (1991) method. Include the rock size, thickness and grading.

b.   [CR Level] Design a filter layer for the rip-rap structure.

c.   [DN LEVEL] How does your rip-rap rock size change if we were to place this on the outer bend of Wisemans? Why does the river curvature affect the rip-rap stability.