A large percentage of the world’s population and commercial centers are in the vicinity of coastal environments. Understanding near shore habitats is critical for management decisions

disaster planning

reduction of environmental impacts

and resolution of challenges resulting from growing populations and rising sea levels. The goal of this study is to predict the maximum detectable bottom depth for CZMIL in the Yellow Sea

the East China Sea region. The coastal waters of China

being considerably polluted

represent typical coastal Case Ⅱ waters with high sediment load and complicated optical properties. Therefore

using satellite algorithms like the ratio of water-leaving radiances at different wavelength to estimate water optical properties may be practically impossible and even provide incorrect results. Hence

an approach for the calculation of diffuse attenuation coefficients at490 nm exclusively for the coastal waters of China is chosen. The map of the CZMIL maximum depth in the Yellow Sea is then shown.The methods used in the study are summarized as follows. First

samples of the Case II water color test collected from the Yellow Sea in the spring of 2003 are used to verify the diffuse attenuation coefficient at 490 nm; the algorithm which is proposed by Wang. et al.

is employed in the verification. Owing to the laser of CZMIL working at a wavelength of 532 nm

the diffuse attenuation coefficient at 490 nm should be recalculated to obtain the diffuse attenuation coefficient at 532 nm. Data processing demonstrates good correlation regression between the diffuse attenuation coefficient at 490 nm and the diffuse attenuation coefficients at other wavelengths（ 412

443

510

520

555

and 565 nm）. Thus

the regression between the diffuse attenuation coefficient at532 nm and the diffuse attenuation coefficient at 490 nm are obtained.In the next step

the CZMIL maximum penetration depth for the coastal waters of China is estimated as the diffuse attenuation coefficient at 532 nm divided by 3. 75

which is a specification of CZMIL provided by Optech Incorporation. The equation is valid for bottom reflectivity above 15%. Then

the CZMIL maximum penetration depth of the entire Yellow Sea and East China Sea region is estimated using the remote measurement data of the NASA space satellite Aqua-MODIS（ hereafter referred to as NASA data） for the said region. The diffuse attenuation coefficient at 490 nm for the NASA data is first calculated using remote sensing reflectance at 490

555

and 670 nm. The diffuse attenuation coefficient at 490 nm is then converted to the diffuse attenuation coefficient at 532 nm. Lastly

the maximum penetration depth is calculated as the diffuse attenuation coefficient at 532 nm divided by3. 75.Two maps show the CZMIL maximum depth and the depth penetration isobaths for the region of interest. The range of CZMIL maximum depth was divided equally into 36 bins

and the detectable area inside each bin was calculated and presented in a pie chart. With the two maps and pie chart as basis

we arrive at the following preliminary conclusions.（ 1） The maximum detectable depth along the Jiangsu coast may vary from 0 m to 10 m.（ 2） The CZMIL maximum detectable depth for the waters near the Yangtze River Delta does not exceed 12 m and extends as far as 200 km from the coastline.（ 3） Within 200 km of the coastline from the continental shelf

the CZMIL maximum detectable depth in the Yellow Sea ranges from 0 m to 50 m

and the area accounts for the 76. 2% of the region of interest.