Surface sediment resuspension and suspended sediment transportation mechanism in the waters around Miaodao Strait
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摘要:
根据实测水文泥沙资料,利用悬浮泥沙沉降公式、泥沙起动流速公式、再悬浮通量与沉降通量公式以及通量机制分解方法,分析了庙岛海峡周边海域的悬浮泥沙时空分布和变化特征,计算了再悬浮通量、沉降通量、单宽悬浮泥沙输运量,探讨了表层沉积物再悬浮和悬浮泥沙运移特征及动力机制。结果表明,悬浮泥沙浓度周期变化与潮流流速周期变化具有较好的相关性,底层悬沙浓度变化对高流速的响应比较明显,表层悬沙浓度变化对低流速响应比较明显;悬浮泥沙单颗粒沉降现象不明显,除庙岛海峡外其他海域较适合悬浮泥沙絮凝沉降,并以中、底层絮凝沉降为主,且表现出自表层至底层絮凝沉降作用逐渐加强趋势;表层沉积物再悬浮对近岸浅水区、庙岛群岛周边海域水体悬浮泥沙浓度的影响显著于其他海域;悬浮泥沙输运整体以平流输运为主,垂向净环流为辅,庙岛海峡南侧向黄海输沙、北侧向渤海输沙,二者同时进行,悬浮泥沙净输运主要由水道向两侧浅滩。
Abstract:Based on the hydrological and sediment measurement data, characteristics of spatiotemporal distributions and variations of suspended sediment concentration and particle size around Miaodao Strait in Bohai Sea were analyzed. By using formulas of suspended sediment settlement, sediment incipient velocity, resuspension flux, and settlement flux, and the flux mechanism decomposition method, the resuspension flux, sedimentation flux, and suspended sediment transport capacity in the study area were calculated. The characteristics and dynamic mechanism of surface sediment resuspension and suspended sediment transport were analyzed. Results reveal a strong relationship between the periodic changes in the suspended sediment concentration and the tidal current velocity. The bottom layer responds obviously to high velocity while the surface layer responds obviously to low velocity. The phenomenon of single particle sedimentation of suspended sediment is not obvious. The hydrodynamic conditions in the sea areas are suitable for flocculation and sedimentation of suspended sediments except for the Miaodao Strait, and are mainly dominated by middle and bottom flocculation and sedimentation. The effect of surface sediment resuspension on the concentration of suspended sediment in the nearshore shallow water area and the sea area around the Miaodao Strait is significantly higher than that in other sea areas. The transport of suspended sediment is mainly advection transport and supplemented by vertical net circulation. In the southern side of Miaodao Strait, sediments are transported to the Yellow Sea, while those on the northern side to the Bohai Sea. The net transport of suspended sediment is mainly from the waterway to the shoals on both sides.
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Key words:
- suspended sediment /
- settlement and resuspension /
- dynamic mechanism /
- Miaodao Strait
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图 2 各站位垂向平均潮流矢量[22]
Figure 2.
图 4 研究区余流场数值模拟结果[21]
Figure 4.
图 7 悬浮泥沙涨落潮段(左图)与表中底各层(右图)平均浓度分布[22]
Figure 7.
表 1 A1—A9各站悬浮泥沙沉降速度
Table 1. The settling velocity of suspended sediment at stations A1-A9
站位 A1 A2 A3 A4 A5 A6 A7 A8 A9 D50/µm 11 10.7 10.9 10.8 11.1 10.4 11.5 11.4 11.6 沉降速度/(mm/s) 0.0275 0.0260 0.0270 0.0265 0.0280 0.0246 0.0300 0.0295 0.0306 表 2 各站位表层沉积物起动流速
Table 2. The critical motion velocity of surface sediment at each station
站位 A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 水深/m 19.2 30.0 14.9 19.1 29.7 10.2 12.0 11.8 17.0 13.6 14.6 5.0 中值粒径/µm 30.8 21.4 41.6 5000.0 1824.8 415.9 124.1 29.1 42.9 35.3 35.8 26.1 起动流速/(cm/s) 46.0 72.0 34.0 119.0 70.0 28.0 22.0 39.0 35.0 37.0 37.0 32.0 表 3 A1—A9各站位再悬浮通量与沉降通量
Table 3. Resuspension and sedimentation fluxes of stations A1-A9
站位 再悬浮通量/(kg·m−2·s−1) 沉降通量/(kg·m−2·s−1) 悬浮时间/h 沉降时间/h 再悬浮量/(kg/m2) 沉降量/(kg/m2) A1 2.91×10−6~1.45×10−3 5.04×10−8~5.41×10−7 16 8 21.40 7.68×10−3 A2 8.57×10−6~3.24×10−3 1.50×10−7~1.03×10−6 19 5 43.47 6.89×10−3 A3 5.33×10−7~1.44×10−3 3.32×10−8~3.63×10−7 15 9 15.36 5.13×10−3 A5 7.40×10−6~3.78×10−4 1.54×10−8~1.27×10−7 5 19 2.30 4.06×10−3 A6 2.37×10−5~3.40×10−4 4.56×10−8~3.61×10−7 10 14 4.61 7.92×10−3 A7 9.50×10−6~6.37×10−4 3.74×10−8~6.39×10−7 15 9 16.53 7.68×10−3 A8 1.04×10−5~2.05×10−3 1.12×10−8~6.54×10−7 16 8 29.28 6.75×10−3 A9 1.03×10−5~1.72×10−3 7.31×10−10~7.07×10−7 13 11 19.47 6.36×10−3 表 4 A1—A9各站悬沙输运项及单宽悬沙净输运率(大潮)
Table 4. Items of suspended sediment transport and the net transport rate of single-width suspended sediment at stations A1-A9 (spring tide)
站位 输沙项 T1 T2 T5 T1+T2 T3+T4 T6+T7+T8 T A1 输沙率/(g·m−1·s−1) 3.89 0.45 2.81 3.62 0.03 0.05 4.29 方向/(°) 154 285 256 160 273 16 200 A2 输沙率/(g·m−1·s−1) 18.68 0.91 9.42 17.93 0.27 0.12 18.00 方向/(°) 142 289 249 144 105 13 173 A3 输沙率/(g·m−1·s−1) 35.94 1.77 3.81 37.50 0.53 0.18 35.16 方向/(°) 265 236 128 264 288 56 260 A4 输沙率/(g·m−1·s−1) 89.97 2.21 4.43 89.38 1.37 0.32 86.12 方向/(°) 62 316 279 61 128 266 60 A5 输沙率/(g·m−1·s−1) 21.33 1.72 12.27 22.83 0.32 0.05 35.38 方向/(°) 261 291 257 263 271 175 261 A6 输沙率/(g·m−1·s−1) 15.74 1.17 1.03 14.77 0.22 0.09 13.67 方向/(°) 87 301 260 85 317 130 85 A7 输沙率/(g·m−1·s−1) 14.71 0.74 2.70 14.01 0.17 0.13 11.44 方向/(°) 67 265 265 66 258 87 62 A8 输沙率/(g·m−1·s−1) 26.04 1.34 2.93 24.77 0.16 0.08 22.73 方向/(°) 42 240 261 41 328 51 36 A9 输沙率/(g·m−1·s−1) 3.21 0.26 2.75 3.19 0.07 0.07 0.43 方向/(°) 164 262 344 169 57 76 186 表 6 B1—B3各站悬沙输运项及单宽悬沙净输运率(大潮)
Table 6. Items of suspended sediment transport and the net transport rate of single-width suspended sediment at stations B1-B3 (spring tide)
站位 输沙项 T1 T2 T3 T4 T5 T6+T7+T8 T1+T2 T B1 输沙率/(g·m−1·s−1) 1.15 0.34 0.00 0.02 0.02 0.01 1.12 1.13 方向/(°) 156 260 336 69 192 92 174 172 B2 输沙率/(g·m−1·s−1) 4.68 0.10 0.01 0.04 0.01 0.00 4.74 4.75 方向/(°) 201 256 21 240 326 99 202 203 B3 输沙率/(g·m−1·s−1) 0.23 0.04 0.00 0.01 0.02 0.01 0.21 0.20 方向/(°) 187 312 187 251 45 325 195 195 表 5 A1—A9各站悬沙输运项及单宽悬沙净输运率(小潮)
Table 5. Items of suspended sediment transport and the net transport rate of single-width suspended sediment at stations A1-A9 (neap tide)
站位 输沙项 T1 T2 T5 T1+T2 T3+T4 T6+T7+T8 T A1 输沙率/(g·m−1·s−1) 7.96 0.48 4.55 7.49 0.03 0.09 3.27 方向/(°) 90 259 259 91 98 47 107 A2 输沙率/(g·m−1·s−1) 10.82 0.09 4.36 10.87 0.11 0.24 7.83 方向/(°) 118 172 260 119 119 296 139 A3 输沙率/(g·m−1·s−1) 18.61 1.30 1.89 19.86 0.11 0.12 19.81 方向/(°) 249 234 161 248 57 80 243 A4 输沙率/(g·m−1·s−1) 30.53 0.25 2.92 30.53 0.24 0.01 28.26 方向/(°) 61 332 273 60 107 327 57 A5 输沙率/(g·m−1·s−1) 16.26 0.98 3.90 17.23 0.02 0.01 19.64 方向/(°) 273 281 216 273 312 279 263 A6 输沙率/(g·m−1·s−1) 10.06 0.54 1.19 9.61 0.05 0.04 8.55 方向/(°) 72 286 275 70 295 81 67 A7 输沙率/(g·m−1·s−1) 4.44 0.57 0.71 3.89 0.00 0.06 3.33 方向/(°) 67 263 273 65 276 71 60 A8 输沙率/(g·m−1·s−1) 12.87 0.48 0.93 12.64 0.12 0.02 12.04 方向/(°) 142 261 278 144 76 13 146 A9 输沙率/(g·m−1·s−1) 3.31 0.28 1.26 3.07 0.03 0.02 2.14 方向/(°) 95 244 242 98 279 357 117 -
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