Sediment sluicing - Revision history

Bendikhansen: Text replacement - "category:Measures" to "category:Solutions"

2020-10-26T10:01:18Z

Text replacement - "category:Measures" to "category:Solutions"

Bendikhansen at 18:33, 30 September 2020

2020-09-30T18:33:29Z

Bendikhansen: /* During planning */

2020-09-30T18:31:52Z

During planning

Bendikhansen at 12:00, 6 April 2020

2020-04-06T12:00:30Z

Bendikhansen: Text replacement - "=Useful MTDs=" to "=Relevant MTDs and test cases="

2020-01-21T14:19:53Z

Text replacement - "=Useful MTDs=" to "=Relevant MTDs and test cases="

Bendikhansen at 14:17, 20 January 2020

2020-01-20T14:17:35Z

Bendikhansen: /* Classification Table */

2019-10-28T10:41:46Z

Classification Table

Bendikhansen: /* Classification Table */

2019-10-17T08:15:22Z

Classification Table

Show changes

Bendikhansen at 12:11, 10 October 2019

2019-10-10T12:11:42Z

Bendikhansen: /* Introduction */

2019-06-22T11:19:42Z

Introduction

← Older revision		Revision as of 10:01, 26 October 2020
Line 43:		Line 43:
	*Morris, G. L., and Fan, J. 1998. Reservoir Sedimentation Handbook: Design and Management of Dams, Reservoirs and Watersheds for Sustainable Use, McGraw‐Hill Book Co., New York		*Morris, G. L., and Fan, J. 1998. Reservoir Sedimentation Handbook: Design and Management of Dams, Reservoirs and Watersheds for Sustainable Use, McGraw‐Hill Book Co., New York

−	[[category:Sediment measures]][[category:~~Measures~~]]	+	[[category:Sediment measures]][[category:Solutions]]

@@ Line 38: / Line 38: @@
 =Classification Table=
 {{Sediment sluicing}}
 [[category:Sediment measures]][[category:Measures]]

@@ Line 14: / Line 14: @@
 Future needs for sluicing operations should be anticipated already in the planning phase of dam and reservoir construction. Appropriate location and level of gate will depend on the characteristics of the dam and should be incorporated in the design of the dam. In best cases, low-level gates can still be implemented after the construction of the dam, but the cost of implementation will be higher.
-Time-series of hydrologic and sediment data are necessary to design the dam and anticipate sluicing operations (see Chapter 5.1.1).
+Time-series of hydrologic and sediment data are necessary to design the dam and anticipate sluicing operations.
-Hydraulic and sediment transport models can be used to estimate yield of sediments to the reservoir, projections of future sedimentation load, sediment trapping rate in the reservoir and sediment transport capacity of the river. Sluicing operations can be simulated with numerical models such as FLUVIAL-12 (see Chapter 9.1 for reference).
+Hydraulic and sediment transport models can be used to estimate yield of sediments to the reservoir, projections of future sedimentation load, sediment trapping rate in the reservoir and sediment transport capacity of the river. Sluicing operations can be simulated with numerical models such as FLUVIAL-12.
 Sluicing can be implemented in all reservoirs, but the duration of the operation varies from some hours to several months according to hydrological catchment size, reservoir storage capacity and characteristics of the flood period.

← Older revision		Revision as of 12:00, 6 April 2020
Line 1:		Line 1:
		+	[[file:icon_sediment.png\|right\|150px\|link=[[Sediments]]]]
		+
	=Introduction=		=Introduction=
	[[file:sediment_sluicing_schematic.png\|thumb\|250px\|Figure 1: Principles of sediment sluicing. During normal hydropower operations, the gates are closed, and water flows though turbines. Prior to sluicing, the reservoir is drawn down, and gates are open. High sediment-laden waters flow through the gates.]]		[[file:sediment_sluicing_schematic.png\|thumb\|250px\|Figure 1: Principles of sediment sluicing. During normal hydropower operations, the gates are closed, and water flows though turbines. Prior to sluicing, the reservoir is drawn down, and gates are open. High sediment-laden waters flow through the gates.]]

@@ Line 31: / Line 31: @@
 Concentration of suspended sediments and turbidity levels in the river must be monitored also after sluicing operations to ensure that their value remain under ecosystems thresholds and that the operation does not have significant impacts on the physical and chemical environment. Additionally, monitoring of sediment deposition downstream the dam, including clogging of sediments and the potential impacts on fish shelter and spawning areas needs to be carried out. Such monitoring can help to implement more sustainable sluicing operations.
-=Useful MTDs=
+=Relevant MTDs and test cases=
 {{Suitable MTDs for Sediment sluicing}}

@@ Line 1: / Line 1: @@
 =Introduction=
-[[file:sediment_sluicing_schematic.png|thumb|250px|Figure 1: Principles of sediment sluicing. During normal hydropower operations, the gates are closed, and water flows though turbines. Prior to sluicing, the reservoir is drawn down, and gates are open. High sediment-laden waters flow through the gates (Kondolf et al. 2014).]]
+[[file:sediment_sluicing_schematic.png|thumb|250px|Figure 1: Principles of sediment sluicing. During normal hydropower operations, the gates are closed, and water flows though turbines. Prior to sluicing, the reservoir is drawn down, and gates are open. High sediment-laden waters flow through the gates.]]
-[[file:sediment_sluicing_threegorges.png|thumb|250px|Figure 2: Seasonal operation of Three Georges reservoir for sluicing (Kondolf et al. 2014).]]
+[[file:sediment_sluicing_threegorges.png|thumb|250px|Figure 2: Seasonal operation of Three Georges reservoir for sluicing.]]
 Reservoir sluicing aims at passing sediment through the dam without allowing deposition. In contrast to flushing which aim to remove deposited sediments, reservoir sluicing focuses on in-coming sediments that are not deposited in the reservoir. Sluicing is performed at periods of high flows, when there is high concentration of sediments in the water, while flushing is executed outside flood and high-flow periods. Reservoir sluicing is not a measure designed for ecosystems living in regulated rivers. However, the supply of sediments induced by sluicing can help to re-balance the deficit in the downstream river if the timing of the operation and the amount of sediments flushed match the transport capacity of the river (Morris et al. 1998, Tigrek et al. 2011, Kondolf et al. 2014). The advantage of this measure is that large amount of sediments is transported during high flows, matching with the transport capacity of the river at this period.

← Older revision		Revision as of 11:19, 22 June 2019
Line 6:		Line 6:

	The objective of sediment sluicing is to maintain the sediments in suspension when they enter the reservoir and convey them out via sluicing gates. Reservoir sluicing necessities a partial emptying of the reservoir prior to flood periods and the incoming of sediment-laden flows. Outlets (sluicing gates) located at low level of the dam are opened allowing passing sediments. Outlets need to have a large flow capacity in order to ensure that high-flows and flood water passing.		The objective of sediment sluicing is to maintain the sediments in suspension when they enter the reservoir and convey them out via sluicing gates. Reservoir sluicing necessities a partial emptying of the reservoir prior to flood periods and the incoming of sediment-laden flows. Outlets (sluicing gates) located at low level of the dam are opened allowing passing sediments. Outlets need to have a large flow capacity in order to ensure that high-flows and flood water passing.
−

	=[[Methods, tools, and devices]]=		=[[Methods, tools, and devices]]=