Detail of JTS/T 231-2-2010

Introduction of JTS/T 231-2-2010

1 General Provisions 1.0.1 This regulation is formulated with a view to specifying modelling technology for tidal current and sediment on coast and estuary, improving the quality of research achievements, and providing waterway engineering construction with scientific criterion. 1.0.2 This regulation is applicable to modelling research for tidal current and sediment of waterway engineering construction project on coast and estuary. 1.0.3 The modelling research work for tidal current and sediment on coast and estuary shall not only comply with this regulation, but also those in the current relevant ones of the nation. 2 Terms 2.0.1 Coast Offshore zone mainly under the dynamic action of the ocean. 2.0.2 Estuary Zone under the combined action of ocean dynamic and river dynamic. 2.0.3 Modelling technology Technology simulating the movement and variation rule of naturally occurring products, including physical model and numerical modelling. 2.0.4 Physical model Model which is reduced by research object according to a certain similarity conditions or similarity criteria, also called solid model. 2.0.5 Numerical modelling A method of value solving according to given definite conditions with respect to the mathematical equation of research object and research problem, also called mathematical model. 2.0.6 Tidal current fixed bed physical model Fixed bed physical model modelling the movement of tidal flow. 2.0.7 Tidal current and sediment physical model Physical model modelling sediment movement under the dynamic action of tidal current. It may be divided into fixed bed model and mobile bed model by mobility of model bed surface and into suspended sediment model, bed-load sediment model and total sediment model by modelling sediment movement morphology. 2.0.8 Fixed bed physical model by tidal current suspended sand silting Fixed bed physical model modelling suspended sand silting variation of research zone under the dynamic action of tidal current. 2.0.9 Mobile bed physical model of tidal current and sediment Physical model modelling bed surface scouring and silting variation under the dynamic action of tidal current, in which the bed surface is paved with model sand in proper thickness. 2.0.10 Wave tidal current and sediment physical model Physical model modelling bed surface scouring and silting variation under the combined action of wave and tidal current, in which the bed surface is paved with model sand in proper thickness. 2.0.11 Physical model of wave littoral transport Physical model modelling littoral transport under the dynamic action of wave, in which the bed surface is paved with model sand in proper thickness. 2.0.12 Model scale Proportional relation between the prototype and each physical quantity corresponding to the model. 2.0.13 Undistorted model Physical model that length, width and height are reduced according to the identical geometrical scale. 2.0.14 Distorted model Physical model that horizontal scale is larger than vertical scale. 2.0.15 Model distortion ratio Ratio between horizontal scale and vertical scale of model. 2.0.16 Geometrical similarity Proportional relation remaining stationary between linear measurements of model and prototype. 2.0.17 Gravity similarity Ratio equality of components of inertial force and gravity in model and prototype in corresponding direction. 2.0.18 Resistance similarity Ratio equality of components of resistance and gravity in model and prototype in corresponding direction. 2.0.19 Dynamic similarity Geometrical similarity of force field that the acting force with the same property by corresponding mass points remains stationary proportional relation in liquid flow of two geometrical similarity systems. 2.0.20 Kinematic similarity Geometrical similarity of velocity field that the traces of corresponding mass points in liquid flow of two geometrical similarity systems are in geometrical similarity and the time required by mass points flowing through corresponding line segment remains stationary proportional relation. 2.0.21 Similarity of bed surface scouring and silting distortion Similarity in scouring and silting position and variation between model bed surface and prototype bed surface within a certain corresponding time interval. 2.0.22 Model sand Solid particle material modelling suspended sediment and bed-load sediment in physical model according to similarity conditions, including natural sand and light-weight sediment. 2.0.23 Boundary condition Controlled condition of water level, water flow, wave, sediment, etc. on the boundary in physical model or numerical modelling. 2.0.24 Initial condition Initial state of water level, water flow, wave, sediment, etc. taken at the beginning of model test or numerical modelling. 2.0.25 Rough Measures adjusting the roughuess of physical model bed surface to meet the similarity conditions of model flow resistance. 2.0.26 Close-packed roughing Roughing mode closely packing sand, gravel or pebble, etc. on model bed surface. 2.0.27 Roughing with spacing Roughing mode arranging gravel, pebble or artificial block, etc. according to a certain spacing and uniformly cementing them on model bed surface. 2.0.28 Pile point method Moulding method shaping model topography according to regular grid node elevation. 2.0.29 Section method Moulding method shaping model topography according to section topography change. 2.0.30 Verification test and verification calculation Test or calculation to inspect and calibrate similarity degree of model and prototype in physical model and numerical modelling. 3 Basic Requirements 3.1 General Requirements 3.1.1 For modelling research, data with respect to natural conditions and effect of human activity, etc. such as weather, hydrology, wave and sediment movement in engineering sea area shall be collected according to engineering project condition, research purpose and requirements, if necessary, relevant survey shall be carried out. 3.1.2 Modelling method shall be determined according to different engineering properties and research stages of coast and estuary as well as natural conditions such as local hydrology, sediment and topography. Important engineering shall be researched by simultaneously adopting physical model and numerical modelling. 3.1.3 The research for the effect of various engineering measures of coast and estuary for tidal level and flow field in engineering zone and its adjacent water area should adopt tidal current fixed bed physical model. 3.1.4 For the research of variation and distribution of sediment scouring and silting in engineering zone and its adjacent water area, sediment physical model shall be adopted based on test research of tidal current fixed bed model scheme. 3.1.5 The mobile bed part of sediment physical model shall be determined according to research purpose and engineering influence range and shall cover the influence range concerned by the engineering. 3.1.6 Sediment physical model should be selected according to the following conditions in accordance with the characteristics of sediment transport dynamic, sediment transport morphology and bed surface scouring and silting variation: (1) Fixed bed physical model by suspended sediment silting shall be adopted when the tidal current dynamic in engineering zone is relatively weak, the surrounding wave has better sheltering conditions and the bed surface topography in engineering zone is mainly suspended sediment silting; (2) Suspended sediment mobile bed physical model shall be adopted when the tidal current dynamic in engineering zone is relatively strong, the surrounding wave has relatively good sheltering condition, and the bed surface scouring and silting variation is mainly suspended sediment; bed-load sediment mobile bed physical model shall be adopted when the bed surface scouring and silting variation is mainly bed-load sediment transport; (3) Wave tidal current and sediment physical model shall be adopted when tidal current dynamic and wave lifting action in engineering zone are relatively strong, the bed surface has scouring and silting variation and is mainly suspended sediment movement. 3.1.7 Physical model of wave littoral transport should be adopted to research shoal evolution problem of sandy coast mainly under wave action. 3.1.8 Tidal current numerical modelling of coast and estuary may be calculated through horizontal two-dimensional tidal current numerical modelling according to engineering properties, technical requirements, and specific conditions of tidal current and runoff in engineering zone, and that in the zone with relatively complex partial tidal current state may be calculated through three-dimentional tidal current numerical modelling. 3.1.9 Sediment numerical modelling of coast and estuary may be calculated through horizontal two-dimensional sediment numerical modelling according to engineering properties, technical requirements, and specific conditions of tidal current, runoff, wave dynamic and sediment movement in engineering zone, and that in partial zone with complex tidal current state and sediment movement may be calculated through three-dimentional sediment numerical modelling. 3.1.10 Shoal evolution of sandy coast caused by wave action and engineering sediment lifting variation should be calculated with wave sediment numerical modelling. 3.1.11 Tidal current modelling on estuary and in its adjacent sea area in consideration of the action of spring, mean and neap tide shall simultaneously consider combined action of runoff with different frequencies from estuary discharging. 3.1.12 Sediment modelling on estuary and in its adjacent sea area shall simultaneously consider the effect of watercourse discharging sediment for sediment scouring and silting in engineering zone.

Contents of JTS/T 231-2-2010

1 General Provisions 2 Terms 3 Basic Requirements 3.1 General Requirements 3.2 Outline of Modelling Test Research 3.3 Instruments and Equipment 3.4 Model Test Record 3.5 Data Processing and Analysis 3.6 Modelling Test Research Report 3.7 Technical Data Filing 4 Test of Tidal Current Fixed Bed Physical Model 4.1 Basic Data 4.2 Model Design 4.3 Preparation Work of Model Making 4.4 Model Making 4.5 Model Test Equipment 4.6 Model Verification Test and Accuracy Control 4.7 Model Flow Characteristic Test 4.8 Scheme Test 4.9 Test Result Analysis 5 Test of Tidal Current and Sediment Physical Model 5.1 Basic Data 5.2 Model Design and Model Sand Selection 5.3 Model Making 5.4 Model Test Equipment 5.5 Model Verification Test and Accuracy Control 5.6 Scheme Test and Accuracy Control 5.7 Test Result Analysis 6 Test of Wave Tidal Current and Sediment Physical Model 6.1 Basic Data 6.2 Model Design 6.3 Model Making 6.4 Model Test Equipment 6.5 Model Verification Test and Accuracy Control 6.6 Scheme Test and Accuracy Control 6.7 Test Result Analysis 7 Physical Model Test of Wave Littoral Transport 7.1 Basic Data 7.2 Model Design 7.3 Model Making 7.4 Model Test Equipment 7.5 Determination of Model Verification and Scouring and Silting Time Scale 7.6 Scheme Test 7.7 Test Result Analysis 8 Numerical Modelling of Plane Two-Dimensional Tidal Current and Sediment 8.1 Basic Data 8.2 Fundamental Equation 8.3 Calculation Mode 8.4 Calculation Area Determination and Grid Partition 8.5 Initial and Boundary Conditions 8.6 Determination of Basic Parameters 8.7 Verification Calculation and Accuracy Control 8.8 Scheme Calculation 8.9 Result Analysis 9 Numerical Modelling of Three-dimensional Tidal Current and Sediment 9.1 Basic Data 9.2 Fundamental Equation 9.3 Calculation Mode 9.4 Calculation Area Determination and Grid Partition 9.5 Initial and Boundary Conditions 9.6 Determination of Basic Parameters 9.7 Verification Calculation and Accuracy Control 9.8 Scheme Calculation 9.9 Result Analysis 10 Numerical Modelling of Plane Two-dimensional Wave Tidal Current and Sediment 10.1 Basic Data 10.2 Fundamental Equation 10.3 Calculation Mode 10.4 Calculation Area Determination and Grid Partition 10.5 Initial and Boundary Conditions 10.6 Determination of Basic Parameters 10.7 Verification Calculation and Accuracy Control 10.8 Scheme Calculation 10.9 Result Analysis 11 Sediment Transport Numerical Modelling of Waves Coast 11.1 Basic Data 11.2 Fundamental Equation 11.3 Calculation Mode 11.4 Grid Partition 11.5 Boundary Condition 11.6 Calculation of Wave Elements and Determination of Water Level 11.7 Verification Calculation 11.8 Scheme Calculation 11.9 Result Analysis Appendix A Calculation Mode in ADI Method Appendix B Calculation Mode in Triangular Element Method Appendix C Calculation Mode of Three-dimensional Tidal Current and Sediment in Vertical Coordinate Transformation Method Appendix D Explanation of Wording in This Regulation Additional Explanation