What are the factors that make the findings of the stream under study different from the characteristic feature of an ideal stream Discussion Topic:

Slides:

Advertisements

Similar presentations

Erosion and Deposition

Advertisements

Earthshapes Unit RIVERS Vincent Raeburn Linlithgow Academy

Introduction and theory

GCSE Geography Enquiry

The long profile of a river

The river from source to mouth Over the period of the next few lessons you will understand how a river changes from source to mouth and include this information.

Stages of a River Stage:Upper Course 1. Source 2. Waterfall

Higher Hydrosphere The Upper Course Areas with steep gradients will have an increased velocity and so the potential for erosion is higher, especially vertical.

Fluvial landforms (1) Landforms of erosion:

River Processes and Landforms.

River Studies. Outline of Events During your river field work you will be visiting two different sites in the lower course of the river. At each site.

A rivers long profile looks something like this:

Landforms of an Upland River R. TEES Source R USK Source.

WHAT CAN YOU REMEMBER? ocean land 2) _________ 3) _________

HYDROSPHERE Rivers processes, profiles and landforms.

Fluvial landforms : Upper course

Running Water Running water Water as an agent of erosion; water in streams, tributaries (larger streams) and rivers that flow down hill therefore changing.

River Environments Rivers have become regular features in the news. In any given year, one or more rivers become notorious for their devastating floods.

Running Water & Groundwater

Chapter 13 Surface Water.

Work and Energy  Energy is the ability to do work or cause change.  Two Types of Energy: Potential Energy = energy that is stored in an object due to.

Stream Erosion & Deposition

RIVERS AN INTRODUCTION.

13 Surface Water 13.1 Streams and Rivers

1 River features? Are facial features the same thing for rivers?

The Changes downstream in a river valley

Stream Erosion and Transport

The hydrologic cycle. Running water Streamflow Two types of flow determined primarily by velocity –Laminar flow –Turbulent flow Factors that determine.

Longitudinal profile Fluvial/River- Areas The path the river follows from its source to mouth is known as the river's course. When studying rivers we.

Rivers: a revision session. River facts River landforms are formed by erosion, transportation and deposition The main processes of river erosion are:

Characteristics of Straight, Meandering, and Braided Channels

Bellwork What do you think the water looks like underneath the surface of these images?

Bradshaw Model. Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness.

We have been looking at how the valley changes downstream.

Case study: The River Tees

AIM: What are the parts of a stream/river?

STREAMS & RIVERS Chapter 6. REVIEW…. The Water Cycle.

11.1 The Active River. Do you think a river can have a source? Describe where you would expect to find a river’s source. The source of a river is where.

RIVERS THE MIDDLE COURSE.

Study of Stream Channel. The variations of channel geometry Group 4.

AIM: What is a stream/river? Do Now: Answer the following questions in your notebooks. Where does the water come from that fills streams and rivers? Where.

The Work of Streams Erosion Destroys the land. The Work of Streams Erosion Destroys the land Deposition Makes new land.

Stream Erosion & Deposition Chapter 6 sections 1 and 2.

Unit 1.3B_4 River Landforms. Now you know a bout the processes that enable the river to change What does the river look like?

R IVER I NVESTIGATION – THE T HEORY !. W HAT IS A D RAINAGE B ASIN ? A drainage basin is an area of land drained by a river and its tributaries. Its boundary.

RIVER CHANNEL CALCULATIONS

LO – To understand the changes in river process with distance from source - To understand Long and Cross Profiles of a river.

River Systems. A river system is an open system. An open system has inputs, processes and outputs. So unlike water in the hydrological cycle, where there.

What is the Bradshaw model?

You have 1 minute to identify and write down as many key terms as possible for each of the following photos...

River Characteristics

RIVERS AS AGENTS OF EROSION, TRANSPORTATION AND DEPOSITION

11.1 The Active River.

Fluvial landforms (1) Landforms of erosion:

DO NOW Pick up notes and Review #30. Have your turned your lab in?

Summary In addition to the oceans, where else is water found on Earth?

Middle course of the river

Discharge, stream flow & channel shape

Gradient The land surrounding the river channel. Valley The middle section of the river. Upper Course The steepness of the river. Mid Course The part of.

Rivers and Streams.

AIM: What is a stream/river?

Changes in a river from source to mouth

Rivers and Streams.

Stages in the Development of a River Valley

Presentation transcript:

What are the factors that make the findings of the stream under study different from the characteristic feature of an ideal stream Discussion Topic:

Differences between stream under study and ideal stream (upper course)

Stream under studyIdeal stream 1.DischargeRelatively largerVery Small 2.WidthWider v-shaped river bed Sharp V-shaped river bed 3.DepthDeeper than middle course Shallow 4.Width- deep ratio Largersmaller Next

Differences between stream under study and ideal stream (upper course) Stream under studyIdeal stream 5.Pebble roundness Partly polished river load Angular river load 6.GradientGentleVery steep 7.VelocityRelatively higherLow Next

Differences between stream under study and ideal stream (upper course) Stream under studyIdeal stream 8.Water flow Less turbulentTurbulent with eddies 9.Special feature No pot hole is found.Uneven river bed, due to abrasion, and forms pot holes. Next

Sharp V-shape

Differences between stream under study and ideal stream (middle course)

Stream under studyIdeal stream 1.DischargeSmaller than upper course Medium 2.WidthRelatively wider than upper course Board V-shaped 3.DepthLess deep than upper course Medium deep Next

Differences between stream under study and ideal stream (middle course) Stream under studyIdeal stream 4.Pebble roundness Angular river load can be found Polished river load 5.GradientVery gentleGentle but steeper than lower course 6.VelocityLower than upper course Medium Next

Differences between stream under study and ideal stream (middle course) Stream under studyIdeal stream 7.Water flow More calmLess turbulent 8.Special feature Erosion and deposition take place Next

Erosion at outer bank Deposition at inner bank

Erosion at outer bank

Deposition at inner bank

Differences between stream under study and ideal stream (Lower course)

Stream under studyIdeal stream 1.DischargeSmaller than middle course (site 6) Large 2.WidthNarrower than site 5 Wide 3.DepthLess deep than middle course Deep 4.Width- deep ratio Site 6’s ratio is less than site 5’s. Next

Differences between stream under study and ideal stream (Lower course) Stream under studyIdeal stream 5.Pebble roundness River load deposited due to construction of dykes. Polished and round river load 6.Hydraulic radius Site 6’s radius is less than site 5’s. Lower the course, higher the radius is. 7.VelocityLower than upper course Medium Next

Differences between stream under study and ideal stream (Lower course) Stream under studyIdeal stream 8.Special feature Dykes are built. Next

Dykes narrowing the lower course.

Why the chosen stream is different from the ideal stream ?? Human Factor !!

Human Factor The chosen stream sections in Pak Tam Chung  modified by human -Bumping station -Construction work -Weit -Holiday Village -Catchwater

Human Factor DISCHARGE -Upper course smaller discharge  Catchwater( 引水道 ) built up, more discharge because of the water collection  Weir( 水堰 ) block the water flow, it smaller the discharge -Middle course greater discharge  The Holiday Village ‘s drainage system collect to the river, increase the discharge  Weir block the water flow, it smaller the discharge -Lower course discharge decrease  The bumping station bump the water away