沿岸部の陸上地形,海岸・海底地形,植生分布,人工構造物の影響を考慮した塩害(海塩濃度)予測システムを構想し,LAWEPSデータによる移流拡散計算とSWANによる波浪シミュレーションを結合した.LAWEPSデータの特性を活かすため,一般曲線座標を用いた拡散移流モデルを提案した.また波浪状態から海塩フラックス量を評価するため,海塩フラックス量と波浪エネルギー散逸率の関係(フラックス補間式)を推定した. この補間式の特徴はフラックス粒径分布が[積算フラックス]×[規格化粒径分布]の形で,2種類の情報に分離されている点である.Monahanら(1988),Smithら(1993,1998)によって提案された2つの海塩フラックス実験式に前記補間式を適合させ,補間式係数を求めた結果,2つの補間式は,比例係数のみが異なる,波浪エネルギー散逸率の相似関数であることが導かれた. 海塩濃度観測データとモデル計算を照合した結果,積算フラックスに関する正しい情報はSmithらの実験式に反映されていることが判明した.###次に海岸人工構造物(特に離岸堤)が沿岸付近の海塩濃度に及ぼす影響についてシミュレーションを行い,観測データとの照合により数値モデルの検証を行った.その結果,観測された海塩濃度の大部分は汀線・離岸堤付近で最大になる砕波から生成される海塩粒子に起源をもつこと,離岸堤は一般に汀線付近の砕波を抑制し沿岸付近の海塩濃度を減少させるが,同時により広域の海岸後背地に海塩粒子を拡散させる影響を併せ持つことが判明した.It conceived of the prediction system for sea-salt concentrations in consideration of land geographical feature near seashore, shoreline and bottom topography, vegetation distribution, and influence of artificial structures, and combined the computation of advection-diffusion of sea-salt particles by use of LAWEPS data with the ocean wave simulation by SWAN. In order to harness the characteristic of LAWEPS data, the advection-diffusion model using generalized curvilinear coordinates was proposed. In order to evaluate amounts of sea-salt emission fluxes from ocean waves, the relationship between sea-salt emission flux and wave energy dissipation rate, an interpolating function, was inferred.###The size-dependent sea-salt emission flux distribution is a form of [flux intensity] x [normalized size-dependent distribution], and is divided into the two kinds of information on sea-salt emission. As a result of fitting the interpolating function to the two empirical formulas for sea-salt emission flux proposed by Monahan et al. (1988), and Smith and others (1993, 1998), and estimating interpolation coefficients, it was concluded that the derived interpolation formulas are the similarity functions of wave energy dissipation rate, in which only the proportionality coefficients differ. As a result of comparing observed sea-salt concentration data with computed one by the model, it became clear that the exact information on the total amount of sea-salt emission flux may be included in the empirical formula of Smith and others.###Next, the simulation was performed about the influence of seashore artificial structures, especially offshore breakwaters, exerted on the sea-salt concentration near shoreline, and the numerical model was verified by collation with the observational data. As a result, generally the great portion of sea-salt concentration has the origin in sea-salt particles generated from breaking waves near shoreline, and offshore breakwaters control breaking waves, and they decrease sea-salt concentration at coast. It became clear that the offshore breakwaters also have an effect that sea-salt particles are diffused more broadly into the hinterland of seashore.